Military officials say a U.S. Air Force base in Germany received a bomb threat hours before the sixth anniversary of the 9/11 attacks. Military police have tightened security and are examining cars and trucks entering the Spangdahlem Air Base.

Someone speaking not native German called the base Monday evening and issued the bomb warning, according to Iris Reiff, a spokeswoman with the public affairs office at the base.

"We've sort of diverted traffic around the main gate area so each of the security forces can get a complete look at the vehicles from the front and side," said Capt. Kevin Koffman, a base spokesman.

CNN