A former CIA operations officer warned of a rise in lone-wolf terror attacks Thursday after a gunman's deadly shooting rampage on Canada's government complex.

"I think everything that you have so far tells you that, yes, this is a lone-wolf attack, almost certainly ISIS-related, ISIS-inspired," Charles Faddis said on "America's Newsroom." "I also think that this is going to be the wave of the future. This is what you're going to continue to see and what we need to get prepared for."

Gunman Michael Zehaf-Bibeau, who killed a soldier before being gunned down inside Ottawa's Parliament building, was "throwing up red flags for a long time," according to Faddis.

Zehaf-Bibeau recently converted to Islam and desperately wanted to move to the Middle East, reports claim. His passport was confiscated after Canadian authorities learned of his plans to go fight overseas.

"There were prominent imams in Canada … talking publicly about recruitment activity on behalf of ISIS going on in their mosques," Faddis said. "That's the loudest warning that you can possibly have that this is going to happen."

Faddis cited the attacks at Fort Hood in 2009 and the Boston Marathon last year as examples of the U.S. government not putting their "arms around the problem and confronting it" here at home.

"Major Hasan … classic case where we had all kinds of warning … and we did nothing to head him off," he said. "There were all sorts of indicators there that we needed to get these guys under control, not just interview them and then go away."