MINNEAPOLIS — A Minnesota restaurant owner upset over what happened in St. Cloud posted a controversial sign Monday morning. 
 
 The sign outside Treats Family Restaurant in Lonsdale, Minnesota, reads “Muslims Get Out.” A second line reads “In Support Of St. Cloud,” reports CBS Minnesota. 
 
 On Saturday, a man stabbed several people at a St. Cloud mall, allegedly asking victims if they were Muslim before attacking them. 
 
 Restaurant owner Dan Ruedinger says the sign has led to some backlash, but he says business is up so much that he had to call in three extra workers Monday. 
 
 “It’s time that people started standing up, not worrying about the PC crowd and do what is right,” Ruedinger said. “And I feel what we’re doing is right. We are not targeting the Muslims in general, just the extremists. And that’s all I can say. It’s my right and I’m going to stand up, and I wish more people would do it.” 
 
 Payten Estepp was part of a group protesting the sign Monday night. 
 
 “I get it, it’s his right to say what he wants to say,” Estepp said. “But that’s giving Lonsdale a bad rap to everyone that drives by on 19, which is a very busy road, so people are going to see that and they’re going to think Lonsdale as a whole, as a community, is as crass as that sign.” 
 
 Ruedinger says he has no plans to take down or change the sign. ||||| (CNN) The man who stabbed nine people at a Minnesota mall Saturday before being shot dead by an off-duty police officer was a "soldier of the Islamic state," according to an ISIS-linked news agency. 
 
 The statement posted online Sunday by the Amaq agency follows a pattern of ISIS-related media claiming responsibility for what appear to be the acts of individuals across Europe in the past few months. 
 
 CNN cannot independently confirm this latest claim. 
 
 "We still don't have anything substantive that would suggest anything more than what we know already, which is this was a lone attacker," St. Cloud Police Chief William Blair Anderson told CNN's Jake Tapper Sunday. "And right now, we're trying to get to the bottom of his motivations." 
 
 The FBI is calling the attack "a potential act of terrorism." 
 
 Community leaders fear anti-Muslim backlash, call for unity 
 
 In response to local reports identifying the attacker as being of Somali descent, members of the Muslim and Somali communities held a news conference Sunday expressing their grief for the victims and calling for unity. 
 
 "We are also concerned about the potential backlash," said Jaylani Hussein, executive director of the Council on American-Islamic Relations (CAIR) chapter in Minnesota. "We understand in St. Cloud there is more anti-Muslim organizing and we hope they do not use this incident to divide ... our community." 
 
 Ahmed Said, executive director of the Somali American Relations Council, had previously disclosed that it was unclear if religion motivated the attack, "but we know he is Somali," the Minneapolis StarTribune quoted him as saying. Authorities have yet to confirm the attacker's ethnicity. CNN was also unable to confirm if he was Somali. 
 
 St. Cloud is home to one of Minnesota's larger immigrant Muslim communities and tensions with some members in the larger community have spiked at times, the StarTribune reported . The Minneapolis newspaper and the St. Cloud Times identified the attacker as a member of the Somali community. 
 
 In 2014, there was damage to mosques in St. Cloud and in 2013 the Muslim community in the city withdrew a bid to build a larger mosque because of tensions, the StarTribune reported. 
 
 Speaking at Sunday's news conference, Mohamoud Mohamed, a spokesman for the Central Minnesota Islamic Center in St. Cloud, emphasized that the central Minnesota Muslim community has no relationship with ISIS or any other "Islamic terrorist group." 
 
 "We are the victims of those terrorist groups," he said. "Islam is peace... I pray for the victims." 
 
 The state was at the center of a federal investigation into the recruitment of fighters for ISIS . Nine Somali-Minnesotans were convicted at trial or pleaded guilty in a plot to travel to Syria to join ISIS. In years back, several dozen male residents left to join Al-Shabaab , a terrorist group working to turn Somalia into an Islamist state. 
 
 "What's remarkable about this case was that nothing stopped these defendants from plotting their goal," said US Attorney Andrew M. Luger of the District of Minnesota in announcing federal charges against the men. 
 
 "They were not confused young men. They were not easily influenced. These are focused men who are intent on joining a terrorist organization by any means possible." 
 
 But on Saturday, a Somali-American mother said she waited fearfully outside the mall Saturday, just like other citizens of the central Minnesota city, because her son was inside during the attack. 
 
 "This has been a dark day; it is a day we will never forget," said Lul Hersi. "Let us unite as one Minnesota... Please let's spread love instead of hate. ISIS does not represent us. It does not represent Islam, and it does not represent Somalis." 
 
 The attack at the mall 
 
 Police and witnesses said the man, wearing a private security company uniform, entered Crossroads Mall on Saturday night around 8 p.m. CT, made a reference to Allah and asked at least one person if they were Muslim before he attacked. 
 
 St. Cloud Mayor Dave Kleis said three people remain hospitalized, including one person who is in a life-threatening condition. 
 
 Ashley Bayne, an employee of JCPenney at the mall, was visiting a coworker at the time of the incident. 
 
 "All of sudden chaos just broke out," she told CNN's Nick Valencia on Sunday. "There was a bunch of people running into the JCPenney mall entrance, and they were just screaming that someone was going around the mall stabbing people, and that there was blood everywhere. It was just honestly a really scary experience." 
 
 Bayne said she ran out to the parking lot and took off in her car. 
 
 The stabbings occurred in multiple locations inside the mall, including the common area and in several stores. The mall has security teams on site but they are not armed. 
 
 Police knew attacker 
 
 While the attacker was not identified, authorities said he'd had three previous encounters with police. 
 
 Anderson said most of the encounters were for minor traffic violations. None resulted in an arrest. 
 
 CNN Map 
 
 Anderson declined to provide further details or say whether the attacker was a resident of St. Cloud. He said he is not ready to describe the stabbings as a terrorist attack until details such as a motive are established. 
 
 He's "clearly a hero" 
 
 The mayor and police chief praised Jason Falconer, an off-duty police officer from nearby Avon, for killing the suspect as the assailant threatened other people in the mall. 
 
 Falconer is a part-time officer for Avon and a former police chief of Albany, Minnesota, the officials said at a news conference Sunday afternoon. Both officials said they had viewed a surveillance tape from a Macy's store which revealed details of the confrontation. 
 
 "Officer Falconer was there at the right time at the right place," Mayor Kleis said. 
 
 "His heroic actions are exemplary of having witnessed what he did as the suspect was lunging at him with a knife. Not only did he fire, the suspect went down, came back up on three different occasions. He protected others from being injured and potentially loss of life. Clearly, a hero." 
 
 City changed forever 
 
 The police chief said two search warrants were executed at an address in St. Cloud, and the suspect's vehicle has been impounded. 
 
 Chief Anderson said the attack had changed the city forever. St. Cloud is about 65 miles northwest of Minneapolis and has a population of 67,000. 
 
 "Whenever something as awful as this happens, it's hard for things to be the same as they were," Anderson said. 
 
 The mall will reopen Monday. 
 
 "Honestly, last night once everything had happened it still felt unreal, it didn't seem like something that would happen at our mall," said Bayne, the JCPenney employee. "I've been a little shaky ... kind of been crying about it a little bit. But it's definitely something you think about after it happens ... It's really scary to think about and I'm ... just thankful to be alive." 
 
 Other attacks 
 
 The mall stabbing was one of several incidents reported nationwide Saturday. 
 
 JUST WATCHED Sources: Device found at second location Replay More Videos ... MUST WATCH Sources: Device found at second location 02:15 
 
 In New York City, an explosion ripped through the Chelsea neighborhood , leaving 29 injured. A second suspicious device was found a few blocks away, authorities say. ||||| Video (03:30) : Including a description of surveillance video from the mall and the FBI's role in seeking out motive. 
 
 – In a few bloody minutes, a man rampaged through a St. Cloud shopping mall Saturday evening, stabbing 10 people before being fatally shot by an off-duty police officer. The violence is being investigated as terrorism, federal authorities said. 
 
 None of the victims, mostly men who ranged in age from 15 to 53, was killed in the attack. Sunday's tally was nine victims. Authorities nudged that total to 10 on Monday. 
 
 In a media briefing after midnight Sunday, St. Cloud Police Chief William Anderson said an off-duty officer from another jurisdiction confronted and shot the suspect Saturday night inside Crossroads Center mall. He said the man — dressed in a private security uniform — reportedly asked at least one victim whether they were Muslim before assaulting them, and referred to Allah ­during the attacks. 
 
 “We are currently investigating this as a potential act of terrorism,” said the FBI’s Richard Thornton, speaking at a news conference at police headquarters early Sunday afternoon. Thornton did not link the attack to a specific terror group. 
 
 Roughly 12 hours after the stabbings, a news agency said to speak for ISIL went to Twitter to claim credit for the mall violence. “The executor of the stabbing attacks in Minnesota yesterday was a soldier of the Islamic State and carried out the operation in response to the citizens of countries belonging to the crusader coalition,” the posting by the AMAQ news agency read. 
 
 “We don’t know if the suspect was in contact with or inspired by foreign terrorist organizations,” Thornton said. 
 
 Gallery: St. Cloud stabbings at mall investigation continues Gallery: St. Cloud stabbings at mall investigation continues 
 
 The FBI’s Joint Terrorism Task Force is looking at the suspect’s social media and other contacts that could shed light on the assailant’s motivation, Thornton said. 
 
 While law enforcement has not disclosed the suspect’s name, his father identified him as Dahir A. Adan, 22. Interviewed Sunday through a translator at his apartment in St. Cloud, Ahmed Adan said his son was born in Kenya but grew up in the United States. Other family members said Dahir Adan was beginning his third year as a student at St. Cloud State University. 
 
 Police told Ahmed Adan about 9 p.m. Saturday that his son had died at the mall, he said. He had “no suspicion” of his son being involved in any terrorist activity, he added. Police raided the apartment on St. Germain Street on Sunday morning and seized photos and other materials, Ahmed Adan said. 
 
 Police executed search warrants for two apartments, including the one where Adan lived with his father, Anderson said. They also impounded the assailant’s car from the mall parking lot. 
 
 Inside the building where the Adans lived, a neighbor said the younger Adan sometimes wore a security guard uniform. A cousin down the hall in the same building described Dahir Adan as a good person who minded his own business. 
 
 At the news conference Sunday, St. Cloud Mayor Dave Kleis said three of the stabbing victims remained hospitalized as of 7 a.m. 
 
 The officer who killed the suspect was identified as Jason Falconer, a former police chief in nearby Albany. 
 
 “The officer’s life was clearly in danger,” Kleis said, pointing to surveillance video that shows the officer shooting and the suspect falling and getting back up three times, at one point lunging toward Falconer. 
 
 Falconer owns Tactical Advantage and Tactical Firearms Training in Waite Park. His professional biography says he “specializes in reality-based firearms, law enforcement and personal security training.” 
 
 Reached by phone Sunday afternoon, Falconer said, “I’ve been trying to stay away from it all, for the time being.” 
 
 Jaylani Hussein, executive director in Minnesota of the Council on American-Islamic Relations, said Sunday that “we are definitely concerned about the potential for backlash in the community, both in the immediate run and the longer term.” 
 
 Hussein called the attack “an isolated incident, and we still don’t know the full facts.” 
 
 Ahmed Said, executive director of the Somali American Relations Council, said they don’t know whether religion motivated Adan, “but we know he is a Somali.” 
 
 “Let us not rush and jump into conclusions,” Said said in a statement. “… We strongly stress that everybody calms down and focus on what unites us than what divides us in these difficult times.” 
 
 Barakad Omar, a classmate of Dahir Adan at Apollo High School, said he was “a good kid” and an A student. 
 
 He was more into sports than religion, said Jama Alimad, a community leader and close friend of the family, who described him as “the most assimilated kid in the neighborhood.” 
 
 Special Agent Richard Thornton of the Minneapolis bureau of the FBI speaks during a press conference on Sunday, Sept. 18 at the St. Cloud Police station. BACKGROUND INFORMATION: Press conference at the St. Cloud Police Station on Sunday, September 18, 2016. A man, suspected of being motivated by global terror, stabbed several people late Saturday before an off-duty police officer fatally shot the attacker at the Crossroads Center mall in St. Cloud. 
 
 Until June, Adan had worked on a contract basis as a weekend security guard at Electrolux Home Products in St. Cloud, said Electrolux spokeswoman Eloise Hale. 
 
 The rampage began when Adan entered through the Sears in the mall’s southeast side; Adan was shot at the north end of the mall, inside Macy’s, according to Kleis. Those stabbed were attacked about 8:15 p.m. in corridors and common areas, authorities said. 
 
 Harley Exsted and his wife, Tama, of Isle, Minn., entered Macy’s at 8 p.m. and soon after heard a popping sound. A group of kids started running toward the mall’s exit. The Exsteds joined a crowd that was fleeing, including a man frantically pushing a baby stroller. As they left Macy’s they heard four more gunshots. “We were terrified,” Harley Exsted said. “We were pretty shook up. We figured we dodged one there.” 
 
 Crossroads Center was closed Sunday but will reopen Monday, said Kevin Berry, spokesman for the Chicago-based company that operates the mall. 
 
 The mall attack got national exposure when Democratic presidential candidate Hillary Clinton mentioned it, saying she’d been briefed about the incident as well as suspicious explosions Saturday in New York and New Jersey, according to the Associated Press. 
 
 Gov. Mark Dayton said he was “appalled at the terrible attacks on innocent Minnesotans in St. Cloud last night. If true that they were motivated by religious bigotry, I condemn them even more strongly. … I ask everyone in the St. Cloud area and throughout Minnesota to rise above this atrocity and act to make religious and racial tolerance one of the ways in which Minnesotans again lead our country.” 
 
 Dayton said he will visit St. Cloud on Monday to show his support for officials and citizens there. 
 
 At the Mall of America in Bloomington, one of the world’s largest shopping malls and often mentioned as a possible terror target, officials said in a statement that “we have implemented additional police and security measures during this time.” 
 
 Jason Falconer 
 
 Tami Dung, who owns Nails Sophisticates at the St. Cloud mall, said she saw people flooding out of the center after her salon closed at 8 p.m. She was busy cleaning up when she saw police cars lining up outside the center. Only after she got home did she hear what had happened. “I was so scared to be too close.” 
 
 Sabrina Bender arrived with three of her children Sunday at the Crossroads Center. Bender had been shopping in the mall the day before with her children. She said she felt safe in St. Cloud until Saturday’s events. 
 
 “It is beyond scary,” she said. “My kids were here.” 
 
 “We will be diligent and get to the bottom of this,” Anderson said, adding that police had prior contact with the suspect, but only related to traffic stops. 
 
 For many years, St. Cloud has been home to one of the state’s larger immigrant Muslim populations. Tensions have spiked at times between Muslims and others in and around the central Minnesota city. 
 
 Staff writers Faiza Mahamud and Erin Adler contributed to this report.
– Muslim families won't be offered any treats at the Treats Family Restaurant in Lonsdale, southern Minnesota: Owner Dan Ruedinger has arranged the sign board outside to read "Muslims Get Out." The sign says it is in "suport" of St. Cloud, where a Somali-American man stabbed nine people in a mall last weekend. Despite what his sign says, Ruedinger says he's not against all Muslims, only extremists. "It’s time that people started standing up, not worrying about the PC crowd and do what is right,” he tells CBS. "And I feel what we’re doing is right." Ruedinger, whose Yelp page has been inundated with negative reviews, says putting up the sign is his First Amendment right. Ruedinger says Islam is a "religion of hatred that preaches violence"—and the Muslims who are "good people" should "hold the others accountable." The Lonsdale News-Review reports that Muslim leaders, including Jaylani Hussein of the state chapter of the Council on American-Islamic Relations, met Ruedinger for what Hussein describes as a "short conversation." A witness says Ruedinger became agitated and started shouting about his son's service in Iraq. Hussein says thousands of Muslims were "shocked and appalled" by the St. Cloud attack and they will continue to try to reach out to Ruedinger.