The Department of Homeland Security has issued a warning to U.S. and some foreign airlines traveling to Russia for the Olympic Games to be on the lookout for toothpaste containers, which some intelligence indicates may actually hold ingredients that could be used to construct a bomb aboard a plane, a senior U.S. official told ABC News.

A federal law enforcement source said the information is largely intended for foreign carriers and the generic threat is not directed at the U.S. homeland. The Russian government has been informed, the source said.

Security in Sochi, Russia, where the Olympics are scheduled to start Friday, has been high for months due to the threat posed to the Games by Islamic militants in the region. Last month Russian authorities announced no liquids would be allowed on planes to Sochi.

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