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Police teams enter Centre Block at Parliament Hill in Ottawa on  Wednesday Oct. 22, 2014.  A soldier standing guard at the National War Memorial was shot by an unknown gunman and people reported hearing gunfire inside the halls of Parliament. Prime Minister Stephen Harper was rushed away from Parliament Hill to an undisclosed location, according to officials. (AP Photo/The Canadian Press, Justin Tang/The Canadian Press/AP)
Police teams enter Centre Block at Parliament Hill in Ottawa on  Wednesday Oct. 22, 2014.  A soldier standing guard at the National War Memorial was shot by an unknown gunman and people reported hearing gunfire inside the halls of Parliament. Prime Minister Stephen Harper was rushed away from Parliament Hill to an undisclosed location, according to officials. (AP Photo/The Canadian Press, Justin Tang/The Canadian Press/AP)

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    What can authorities learn from Ottawa shootings?

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What can authorities learn from Ottawa shootings?

Former executive assistant director of the FBI Shawn Henry and former senior FBI profiler Mary Ellen O'Toole discuss.

What can authorities learn from Ottawa shootings?

Former executive assistant director of the FBI Shawn Henry and former senior FBI profiler Mary Ellen O'Toole discuss.