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The sort of terrorist attack that worries him the most these days isn't the massive kind that homeland security officials have long dreaded, one that would kill or injure Americans by the thousands or the tens of thousands, Vice President Joe Biden told CBS News' Harry Smith on The Early Show
Instead, it's the much smaller attack by a lone wolf attacker that worries him most, he said.
Biden told Smith:
"I'm very concerned about a terrorist attack on the U.S. along the lines of the Christmas Day bomber. You get a disgruntled student, someone who has some relationship to the U.S, who is able to be recruited quickly, able to be indoctrinated quickly. And they say basically 'OK, here's a bomb. Go do it.' As opposed to the kind of planning that's needed to pull off a very complicated 9/11. Am I less worried about an attack? No. I'm worried. Am I less worried about a catastrophic event? Yes."