WASHINGTON (AP) — The Homeland Security Department is banning all liquids from carry-on luggage for nonstop flights from the U.S. to Russia.

The ban comes after the department warned airlines that terrorists might try to smuggle explosives on board hidden in toothpaste tubes. The warning said terrorist might try to assemble explosive device in flight or upon arrival at the Olympics.

Delta Airlines, the only U.S. airline with regularly scheduled nonstop flights to Russia, posted a warning about the Transportation Security Administration policy Thursday.

The government warning became public on the eve of the Winter Olympics in Sochi, Russia. Homeland Security has said the government is not aware of a threat to the U.S.

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