Navy ships collide a day before arrival in San Diego

Two U.S. Navy ships collided Wednesday off the coast of San Diego, according to Navy officials. No injuries have been reported and the cause of the accident is still under investigation, but it appears to be a steering malfunction, Navy spokesman Cmdr. Charlie Brown said. Both ships -- the USS Essex, an amphibious assault ship, and the USNS Yukon, a refueling ship -- were damaged, but the full extent was not immediately known, Brown said.