Seven US Navy crew members are missing after their ship collided with a merchant vessel off the coast of Japan.
Among the injured is the USS Fitzgerald’s commanding officer, who was taken to hospital by helicopter.
The destroyer collided with the container ship about 56 nautical miles (104km) south-west of Yokosuka.
Aerial images showed heavy damage to the Navy ship’s starboard side after the collision at about 02:30 local time on Saturday (17:30 GMT Friday).
The collision occurred near Yokosuka, a Japanese port city that is home to the US 7th Fleet, which comprises up to 80 submarines and ships and including the USS Fitzgerald.
It is unclear where the 154-metre (505ft) guided missile destroyer ship was heading at the time.
The ACX Crystal, a 222-metre (730ft) Filipino-flagged container ship, was travelling between the Japanese cities of Nagoya and Tokyo.
Marine traffic records suggest the ACX Crystal made a sudden U-turn roughly 25 minutes before the collision with the USS Fitzgerald. It is not clear why it changed course.
Marine traffic records suggest it was travelling at 14.6 knots (27km/h) at the time of the collision.
Marine traffic records for the USS Fitzgerald are not publicly available.
How bad are the damage and injuries?
Japan’s coastguard is co-ordinating the search with US teams for the seven missing crew members. As of late afternoon local time, the 7th Fleet said the crew members were still unaccounted for.
The Navy ship’s commanding officer, Cdr Bryce Benson, was in a stable condition after being transferred to US Naval Hospital Yokosuka, according to Navy officials.
Two other sailors were flown to hospital by helicopter for treatments for “lacerations and bruises”, the 7th Fleet said on Twitter.
By mid-afternoon local time, it said that all flooding on board the USS Fitzgerald was under control. It is not at risk of sinking.
The ship has now returned to Yokosuka – under its own power, but with limited propulsion.
The Japanese coastguard said the ACX Crystal weighed just under 30,000 tonnes, about three times that of the USS Fitzgerald.
It sustained lighter damage to its port bow, and has now reached Tokyo.
The Associated Press agency said there were no injuries reported among the 20 Filipino crew members on board the container ship.