President Barack Obama says a "lone wolf" terror attack in the U.S. is more likely than a major coordinated
effort like the Sept. 11 attacks.
Obama says a "lone wolf" attack would be one like what happened in Norway last month, when one person killed dozens of people, apparently with little or no outside support.
Still, Obama says the U.S. government is monitoring all potential terror scenarios and is not letting its guard down.
And he says there may be "a little extra vigilance" in monitoring potential terror risks as the 10th anniversary of the Sept. 11 attacks approaches.
Obama made his remarks in an interview Tuesday with CNN.