冬奥会开幕前美飞俄航班禁液体登机

U.S. transportation security officials are banning American travelers from carrying any liquids, gels or sprays on flights to Russia because of a possible terror threat.

Various reports say authorities gave the order Thursday, one day before the Winter Olympics officially open in Sochi. They say they will respond to protect Americans against what they call an "ever evolving threat picture."

Russia banned liquids from carry-on luggage on flights last month.

U.S. homeland security officials have warned airlines flying to Russia to watch out for toothpaste tubes that may be filled with explosives. They gave no details on the intelligence that led to the warnings.

Islamic extremists have threatened to disrupt the Olympics.