The US has diverted the nuclear-powered aircraft carrier USS Nimitz and other ships towards the Red Sea in preparation for a possible strike in Syria, defence officials have told Reuters.
The Nimitz carrier group had been in the Indian Ocean and was due to return to port in Washington, but has reportedly been redirected.
It has no specific orders to move to the eastern Mediterranean at this point, but is moving west in the Arabian Sea so it can do so if asked.
The US has already deployed an additional two destroyers in the eastern Mediterranean over the past week, bringing to the total to five.
USS San Antonio, an amphibious ship with 300 Marines and extensive communications equipment on board, has also been diverted to the area.
More top news
A hacker group who claimed to be behind a cyber attack on Sony Pictures have posted a message online apparently mocking the FBI.
The returns of Benedict Cumberbatch's detective and the X Factor judge were among 2014's most tweeted TV moments in a billion conversations.
A family has issued an appeal to help find their missing pet turkey - in case he gets gobbled up as someone's Christmas dinner.