The US has warned airlines flying into Russia for the Winter Olympics that explosives hidden in toothpaste tubes could be smuggled on to planes.
The Department of Homeland Security alert comes ahead of the Sochi Winter Olympics, scheduled for February 7-23.
An official said the airlines were warned that explosive devices could be assembled in flight or upon arrival at the Olympics, although the authority said in a statement that the US “isn’t aware of a specific threat to the homeland at this time".
The Department of Homeland Security said in a statement to the BBC that it “regularly shares information with domestic and international partners, including those associated with international events such as the Sochi Olympics”.
The White House National Security Council said the latest threat had not altered existing travel guidelines for Sochi.
The US has also placed two warships in the Black Sea in case of a security breach during the Games.
