( CNN ) -- The Ottawa gunman had `` connections '' to jihadists in Canada who shared a radical Islamist ideology , including at least one who went overseas to fight in Syria , multiple U.S. sources told CNN on Thursday . However , Canadian Foreign Minister John Baird told CNN 's Christiane Amanpour that there is `` no evidence at this stage '' that Michael Zehaf-Bibeau was linked to a wider group , or network , of jihadists . `` There 's no evidence at this stage for us to know that . Obviously there 's an investigation going on , and we hope to learn more in the ... coming days . It was clear that , police authorities now have announced , that he was acting alone yesterday , '' he said . According to two U.S. counterterrorism officials , Zehaf-Bibeau was connected to Hasibullah Yusufzai through social media . Yusufzai is wanted by Canadian authorities for traveling overseas to fight alongside Islamist fighters in Syria , The Globe and Mail , a Canadian newspaper , reported . The sources said the two communicated via social media and the Internet , but it does not appear they were close . Early indications are that Zehaf-Bibeau 's connections to other extremists were `` interactions '' online , including extremist sites , a different U.S. source said . The activity was `` attenuated , '' or limited , the source said , noting it appears , so far , that Zehaf-Bibeau had a low profile . There is no evidence so far that he had any `` operational links '' to other jihadists , according to the source , who drew a distinction between interacting online and plotting an attack . American officials are reportedly scouring databases and communications for possible links to American-based jihadists . Other radicalized people connected to Zehaf-Bibeau are still believed to be living in Canada , U.S. law enforcement officials said . `` The investigation is ongoing and will rapidly determine if Zehaf-Bibeau received any support in the planning of his attack , '' Royal Canadian Mounted Police Commissioner Bob Paulson told reporters Thursday . Officials now have `` information that suggests an association with some individuals who may have shared his radical views , '' he said . Paulson did n't say who these people are or how Zehaf-Bibeau may have interacted with them . The gunman . Authorities are still in the early stages of their investigation , but they are beginning to piece together the puzzle . They released surveillance video Thursday that shows events on Wednesday . In the footage , a vehicle pulls up near Parliament , and a man exits , running with a large gun as people run from him . In other footage , this same man then gets into another vehicle , drives to a nearby building , gets out and runs armed into the building pursued by law enforcement . Baird , in a Thursday night interview with Anderson Cooper on CNN , described the chaos inside the building , saying Zehaf-Bibeau `` ran right by the room where the entire government caucus was . We could hear the ringing out of rifle fire and then the huge amount of semiautomatic noise . `` We did n't know if the door would be banged open and that we 'd all be sprayed , '' he said . Baird said the sergeant-at-arms of the House of Commons shot and killed Zehaf-Bibeau at the door to the library , which contained a tourist group as well as employees . `` You could have seen more than a dozen killed if he ( the sergeant-at-arms ) had n't taken such quick action , '' Baird said . Zehaf-Bibeau was a Canadian citizen who may have had dual Libyan-Canadian citizenship , said Paulson . The police commissioner said Zehaf-Bibeau was born in Montreal and lived in Calgary and most recently Vancouver . Zehaf-Bibeau had been in the Canadian capital since at least October 2 `` to deal with a passport issue and ... he was also hoping to leave for Syria , '' Paulson said . Paulson also said of Zehaf-Bibeau : `` According to some accounts , he was an individual who may have held extremist beliefs . '' Zehaf-Bibeau was applying for a passport -- an application that was under investigation -- at the time of the attack , but had not had his passport revoked , as has been previously reported , Paulson said . `` I think the passport figured prominently in his motives , '' said the police commissioner . `` However , we have not come to ground completely on his motivations for this attack . But clearly , it 's linked to his radicalization . Clearly , it 's linked to his difficult circumstances . '' According to Paulson , investigators thus far have not found any connection between Zehaf-Bibeau and Martin Rouleau Couture -- who authorities say ran down and killed a Canadian soldier in Quebec on Monday . Police later killed Couture . Who was Ottawa shooter Michael Zehaf-Bibeau ? Zehaf-Bibeau was born as Michael Joseph Hall in 1982 . He had criminal records indicating infractions related to drugs and violence and other criminal activities , Paulson said . In a pre-trial psychiatric evaluation performed in 2011 , a doctor noted Zehaf-Bibeau at that time had been `` a devoted Muslim for seven years . '' The gunman 's mother , Susan Bibeau , spoke to The Associated Press by phone . She struggled to hold back tears and said she did n't know what to say to those hurt in the attack . `` If I 'm crying , it 's for the people , '' Bibeau reportedly said . `` Not for my son . '' `` I 'm mad at my son , '' she said in a separate email to the AP . Harper : `` We will not run scared ' Canadian lawmakers returned to work Thursday , giving a standing ovation to the ceremonial Parliament official credited with taking down the gunman who killed a soldier and shook the Parliament area . `` We 'll be vigilant , but we will not run scared . We will be prudent , but we will not panic . And as for the business of government , well , here we are -- in our seats , in our chamber , in the very heart of our democracy , '' Canadian Prime Minister Stephen Harper told the House of Commons in Ottawa . Lawmakers stood and cheered Sergeant-at-Arms Kevin Vickers , who officials say took down the suspect in the halls of Parliament minutes after the killing of Canadian army reservist Cpl . Nathan Cirillo at a war memorial nearby . Vickers , who regularly leads a procession into the House as sessions begin , stood with his ceremonial mace and appeared to be emotional during the ovation . He later released a statement saying he is touched by the attention . `` However , I have the support of a remarkable security team that is committed to ensuring the safety of Members , employees and visitors to the Hill , '' Vickers said . It was a step toward normalcy for a government district that was widely locked down for hours after the shootings at Canada 's National War Memorial and Parliament Hill . Authorities say Zehaf-Bibeau shot and killed Cirillo , who was standing guard at the war memorial on Wednesday morning . The gunman then entered the nearby main Parliament building in downtown Ottawa , where witnesses say shots were fired -- many by security officers -- before he was shot dead . A plainclothes constable who was working security at Parliament was shot in the leg , according to a House of Commons official briefed on the investigation . The injury is not life-threatening , and the constable was treated at a hospital and released , the official said on condition of anonymity . The shootings left government workers and others locked inside offices for a large portion of the day while police searched buildings to ensure that no other culprit was loose . Wednesday 's deadly attack was the second on Canadian soldiers this week . On Monday , Couture , a convert to Islam who Canadian authorities said was `` radicalized '' hit two soldiers with a car in Quebec , killing one of them , before he was killed . Lawmakers pay respects to soldier . There was an incident Thursday morning as the Prime Minister and his wife were laying a wreath , in memory of Cirillo . An eyewitness said a man began yelling . He reached into his jacket , then pulled out a white scarf , and wrapped it around his face . About a dozen police ran towards him , the eyewitness said . The Prime Minister and his wife had intended to stay longer , but his security team surrounded them and quickly ushered them out . `` He 's lucky he was n't shot , '' the eyewitness said of the man . The man was apprehended at the scene . Jim Cirillo , Nathan Cirillo 's uncle , told CBC News that Cirillo 's father is in Costa Rica and might not yet know about his son 's death . `` I do n't know if life is fair , '' Jim Cirillo , said his voice breaking with emotion . `` He did n't deserve that . I do n't know how someone could have picked him out and just did that . '' Before Parliament reopened , lawmakers gathered outside the memorial -- some holding flowers -- for a moment of silence for Cirillo . `` This was very off the cuff , '' lawmaker Charlie Angus told CNN on Thursday morning . `` I think parliamentarians really just felt that before we walked into the Parliament buildings , we had to pay respect to a young man who gave his life for his country . '' Angus said the soldiers ' killings this week left the government with plenty of questions . `` The questions we need to ask ourselves ( include ) , 'How are these people getting this crazy ideology that 's inspiring them to do these copycat killings ? ' `` he said . Another question , he said : What can society do to deal with people who find themselves on the fringes ? Issues of mental health , he said , need to be addressed . `` We can not let people like this fall through the cracks and end up doing deranged killings , '' Angus said . CNN 's Ashley Fantz , Josh Levs , Catherine E. Shoichet , John Newsome , Pamela Brown , Greg Botelho , Elise Labott , Jim Sciutto , Pam Brown , Andrea Lewis , Ana Cabrera and Deb Feyerick contributed to this report .
Michael Louis - Bibeau had not had his passport stamped , as previously reported . He was looking for one and police believe the passport could have figured into motive . The gunman 's interactions with extremists were limited , a source says . There is no evidence so far that he had any ` ` operational ties '' to them , source says .