Good morning, everyone. Im alex witt. The first day of the sochi Olympic Games is marked by a disturbing new terror threat. The feds warning terrorists could try to smuggle explosives on to planes inside toothpaste tubes. U. S. Officials emphasize the warning is focused entirely on flights to russia, not on flights to or within the u. S. Those familiar with the advisory tell nbc news, it is based on very recent intelligence. There is no word so far on any plans to impose new restrictions on checked bags or carryones. The russians have already banned all liquids from carryones. U. S. Officials say there is no indication of any specific plot or target. Instead, this is an exercise of caution, and officials did not reveal the source of the intelligence. Meanwhile, the u. S. Navy warship taylor entered the black sea. Defense officials tell nbc news it will join the u. S. Command ship mt. Whitney. Both will remain on stand by during the games and offer assistance if athletes are forced to e