The UK raised the terrorism threat level in its advice for citizens traveling to Germany and France to "high" from "general."

英国则提醒在德国和法国旅行的本国公民，将这两个国家的恐怖威胁级别从“普通”提至“高级”。

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The federal government remained at a "heightened state of vigilance, " but the Department of Homeland Security has no plans to raise the national terrorism threat level, Secretary Janet Napolitano said.

CNN: U.S. anticipates al Qaeda 'threats of retaliation'

"While we continue to be at risk to the threat of terrorism at an elevated level, extensive protective measures remain in place throughout our nation, " he said.

CNN: Terror threat lowered to Yellow

And there is still no common appreciation of the level of threat posed by nuclear terrorism, our correspondent says.

BBC: Obama in push for 'world without nuclear weapons'