BBC News Online: World: Americas

FBI fears more terror attacks

The FBI also warned that US interests overseas may be at risk.

The FBI says it has received information which leads it to believe that the threats are credible, although no targets have actually been specified.

It says it has asked all local law enforcement agencies to be on the highest alert, and has called on people to be vigilant.

"Certain information, while not specific as to target, gives the government reason to believe that there may be additional terrorist attacks within the United States and against US interests overseas over the next several days," the FBI said in a statement.

It was the FBI's second such request this week, but the first to suggest attacks might be imminent.