Before Canada Shooting, Terror Fears

Officials investigate shooting suspect.
2:29 | 10/23/14

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Transcript for Before Canada Shooting, Terror Fears
The team is right here this evening. Martha Raddatz and Brian Ross. Brian, the big question here, was this suspect doing this for Isis? Reporter: Well, David, tonight, Canadian and U.S. Officials are searching for clues online and in criminal and travel records about the suspected shooter, described as 32 years old and a recent convert to Islam. The big question is, whether he is one of the 90 or so Canadian citizens under active investigation or surveillance as possible Isis terrorists. And whether others may be planning follow-on attacks. Just two days ago, one of those 90 Canadians, who boasted of his ties to Isis and had his passport revoked was shot dead in Quebec after he used his car to run down two Canadian soldiers in uniform, killing one of them. What took place yesterday is clearly linked to terrorist ideology. Reporter: Authorities say so many Canadians have gone to Syria to join Isis that they have even created their own recruitment videos with iconic Canadian scenes. Before Islam, I was like any other regular Canadian. Reporter: Canadians have been seen burning their passports and carrying out brutal murders. And the internet has been full of Isis propaganda videos with calls to kill Canadians, along with other allies of the united States. Using whatever weapons are available. Said one leader, "Kill him in any manner or way, however it may be." When you see one attack, it crops up others. Reporter: More in Canada may be expected? I would not be surprised. Reporter: A confidential U.S. Homeland security report issued just yesterday and obtained by ABC news says with the increased efforts to stop Isis sympathizers from heading to Syria, more attacks are to be expected. All right, so, authorities are expecting more of these. Brian, thank you. And Martha, you reported that the FBI had a warning days ago, saying perhaps Isis had given specific instructions. Reporter: This came out on October 11th. Listen to this. They said an isised all owe reporting urged sympathizers to target police, soldiers and intelligence officers. It's the homegrown extremists that the FBI and others are so worried about. People who might follow Isis, they might not even believe in what they believe in but they just want to be part of a group. And of course, the U.S. Embassy up there, locked down today, as well. Martha Raddatz, Brian Ross, Dan Harris, thank you all. We're going to turn now to a

This transcript has been automatically generated and may not be 100% accurate.

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