PIKE COUNTY, Ohio --A Facebook threat mentioning one of the eight members of an Ohio family who were shot and killed execution-style on Friday is among the the evidence investigators are examining, CBS News has confirmed. 
 
 The threat specifically called out Christopher Rhoden Jr., who died along with seven other members of the Rhoden family, in a string of shootings at four rural locations. 
 
 "I'm aware of the Facebook threat," Ohio Attorney General Mike DeWine told CBS News. "Every piece of information is valuable and our investigators are certainly taking that into consideration." 
 
 Pike County Sheriff Charles Reader, said most of the victims were targeted while they were sleeping. He said it was clear the family was targeted and that he has warned the surviving members of the Rhoden family to take precautions and arm themselves. 
 
 "I cautioned them, told them we will be there," Reader told CBS News. "I told (them) to be armed." 
 
 One member of the family, who asked not to be identified, said the relatives are "torn up" over the murders. 
 
 "And you know what I mean, kinda freaked out because we don't know. There's still killers on the loose, or killer," he said. 
 
 Authorities confirmed Sunday that marijuana grow operations were found near some of the sites where the Rhoden family members were murdered. 
 
 A law enforcement source has confirmed that investigators found some 200 marijuana plants in the executed Ohio family's indoor grow operation, CBS News senior investigative producer Pat Milton reports. 
 
 The source said the size of operation indicates it was being grown for sale not for personal use. 
 
 Each plant could produce about one pound of marijuana. A pound of high-grade quality marijuana has a street value of about $2,000. 
 
 A second law enforcement source said that investigators are looking at numerous avenues as a motive for the killings among them is whether there is a Mexican drug cartel connection or a possible drug turf war or family feud. 
 
 The Friday killings at four different homes near Piketon, Ohio, was "a sophisticated operation," DeWine said at a news conference in the small community that has been on edge since the seven adults and one teenage boy were found shot in the head. 
 
 DeWine cautioned it was too soon to determine if the marijuana grow operations and the murders were directly connected. 
 
 At the Dogwood Festival in downtown Piketon on Sunday afternoon, the crowd was smaller than usual. Courtney Boyer came with her infant daughter. 
 
 "People are scared to come out," she said. "What if that person who shot all those people is running around here. You don't know who it is. Or what they're capable of doing?" 
 
 Authorities have been scrambling to determine who targeted the clan and why. Investigators have interviewed more than 30 people in hopes of finding leads in the deaths. 
 
 The victims were identified Saturday as 40-year-old Christopher Rhoden Sr.; his 16-year-old son, Christopher Rhoden Jr.; 44-year-old Kenneth Rhoden; 38-year-old Gary Rhoden; 37-year-old Dana Rhoden; 20-year-old Clarence "Frankie" Rhoden; 20-year-old Hannah Gilley; and 19-year-old Hanna Rhoden. 
 
 It appeared some of the family members were killed as they slept, including Hanna Rhoden, who was in bed with her newborn baby nearby, authorities said. The infant was 4- or 5-days old. The baby, Hannah Gilley's 6-month-old baby, and 1 other small child were not hurt. 
 
 Since the slayings, authorities have refused to discuss many details of the crime, including any evidence or the search for the assailant or assailants. 
 
 Investigators sought tips and gave people a number to call if they had any details about the crimes. A Cincinnati-area businessman also put up a $25,000 reward for information leading to the capture and conviction of the killer or killers. 
 
 Two of the crime scenes are within walking distance of each other along a sparsely populated, winding road that leads into wooded hills from a rural highway. 
 
 The third residence is more than a mile away, and the fourth home is on a different road, at least a 10-minute drive away, said the investigation's leader, Benjamin Suver, a special agent in charge with Bureau of Criminal Investigations. 
 
 An out-of-breath caller who found two of the eight family members told a 911 dispatcher in a quavering voice that "there's blood all over the house." 
 
 "I think my brother-in-law's dead," she said, her voice rising as she adds later that it looks like someone has "beat the crap out of them." 
 
 "I think they're both dead," she said before breaking down into sobs, according to one of two 911 call recordings released Saturday by the state attorney general's office. 
 
 Phil Fulton, the pastor of Union Hill Church up the road from where some of the victims were found, described the family as close-knit and hardworking. He said they were previously part of his congregation, though not recently. 
 
 "We're just doing everything we can to reach out to the family to show them love and comfort," Fulton said. 
 
 Kendra Jordan, 20, said she often worked nights at a nursing home with the mother of the newborn and described her as outgoing, funny and always smiling. 
 
 "If you were having a bad day, she'd be the first one to come up to you to question you about what was going on," Jordan said. "She was amazing." 
 
 Jordan said the town would have difficulty recovering from the loss of a such a well-known family in the tight-knit community. 
 
 "Everyone knows that family, you can't not know that family," she said. "They're involved in everything, and they're at every event that's going on in town. Just about see them anywhere you went." ||||| The execution-style murders of eight members of the same family in rural Pike County, Ohio, has set residents on edge and sent investigators into overdrive as they try to find out who killed the Rhoden family members, and why. 
 
 Adding to the intrigue: the discovery of marijuana growing operations at three of the four crime scenes. 
 
 Here's what we know, and don't know, about the crimes: 
 
 The killings 
 
 What we know: 
 
 In a series of what investigators called well-planned, execution-style killings carried out at four locations, eight members of a single family were methodically shot in the head Friday while they slept in their homes about 50 miles south of Columbus. 
 
 A relative discovered the bodies. 
 
 "There's blood all over the house," the woman told 911 operators. "My brother-in-law is in the bedroom. It looks like they beat the hell out of him." 
 
 Authorities identified the victims as Hannah Gilley, 20; Christopher Rhoden Sr., 40; Christopher Rhoden Jr., 16; Clarence "Frankie" Rhoden, 20; Dana Rhoden, 37; Gary Rhoden, 38; Hanna Rhoden, 19; and Kenneth Rhoden, 44. 
 
 Authorities in Ohio released this chart tracing the relationships of the slain Rhoden family members. 
 
 Amid all the carnage, three children were found unharmed -- a 4-day-old infant who was next to her mother when she was killed, a 6-month-old baby and a 3-year-old. State authorities are now caring for the survivors. 
 
 Two of the residences where the killings took place are within walking distance, authorities said. A third is about a mile away and the fourth about eight miles away, they said. 
 
 What we don't know: 
 
 Who killed them, or why. Authorities do, however, think the killers were familiar with the victims. 
 
 "It was a sophisticated operation and those who carried it out were trying to do everything they could do to hinder the investigation and their prosecution," Ohio Attorney General Mike DeWine said. 
 
 JUST WATCHED 911 call: There is blood all over the house Replay More Videos ... MUST WATCH 911 call: There is blood all over the house 02:13 
 
 Marijuana grow operations found 
 
 What we know: 
 
 Extensive marijuana grow operations were found at three of the sites, DeWine told reporters Sunday. 
 
 An official with knowledge of the operation told CNN's Nick Valencia that the marijuana wasn't being grown for personal use. 
 
 An aerial view of one of the crime scenes. 
 
 "It was for something much bigger than that. It was a very sophisticated operation," the official said. 
 
 Such operations are often located indoors, and use elaborate lighting, watering and feeding systems designed to yield crops every three to four months, according to an April article in Police Chief magazine 
 
 What we don't know: 
 
 Whether the killings had anything to do with the marijuana grow operation. 
 
 The investigation 
 
 What we know: 
 
 It's likely to be lengthy. 
 
 DeWine said police have executed at least five search warrants and 50 of 60 people have been interviewed so far. Authorities have received 100 tips and 18 pieces of evidence have been submitted to the crime lab. Seven of the eight autopsies have been performed so far, he said. The last one scheduled is for Monday, said DeWine. 
 
 What we don't know: 
 
 What investigators have found or how many guns were used in the shootings. 
 
 Family warned 
 
 What we know: 
 
 Pike County Sheriff Charles Reader 
 
 Pike County Sheriff Charles Reader said he has cautioned surviving family members that they may still be in the killers' crosshairs. 
 
 "We have a specific family that's been targeted but I don't think there's been a threat to any other members of the community," he said. "I cautioned them they are a target and I cautioned them, 'Be armed.'" 
 
 What we don't know: 
 
 Exactly why the Rhoden family had been targeted -- or if it had anything to do with the marijuana operation. 
 
 Pot in Pike County 
 
 What we know: 
 
 Pike County is no stranger to marijuana problems. In August 2012, Ohio law enforcement officers found "a major marijuana grow site in Pike County with suspected ties to a Mexican drug cartel," according to a press release DeWine's office issued at the time. 
 
 Investigators destroyed about 1,200 marijuana plants and found two abandoned campsites they believe belonged to Mexican nationals, the release said. 
 
 What we don't know: 
 
 DeWine has not indicated any connection between the 2012 findings and the operations found on the Rhoden properties.
– A new development in Ohio: One of the eight family members killed in a horrific mass slaying had already been threatened on Facebook, CBS News reports. The threat was directed at Christopher Rhoden Jr., who at 16 was the youngest of the victims. "I'm aware of the Facebook threat," says Ohio Attorney General Mike DeWine. "Every piece of information is valuable and our investigators are certainly taking that into consideration." Now Pike County Sheriff Charles Reader has told surviving Rhoden family members to be careful. "I cautioned them, told them we will be there," Reader says. "I told [them] to be armed." One surviving family member says the Rhodens are "torn up" about the killings. "And you know what I mean, kinda freaked out because we don't know," says the relative, who asked not to be identified. "There's still killers on the loose, or killer." The slayings happened in four rural homes near Piketon, Ohio, a town of about 2,200 where the Dogwood Festival on Sunday had a smaller-then-usual turnout. "People are scared to come out," says a resident. "What if that person who shot all those people is running around here." Now autopsies of all eight victims have been completed, News Net 5 reports, and a chart of the Rhoden family relationships can be seen here. (Marijuana-growing was found at three of the four murder sites.)