The U.S. 7th Fleet said on its Facebook page that it was working with the Japanese Coast Guard to conduct a medical evacuation of a sailor, and that there were currently no reports of deaths.

Seven crew members are reportedly missing and one injured after a U.S. Navy destroyer collided with a merchant ship off the coast of Japan, the country’s coast guard reported.

Footage from Japanese TV network NHK on Saturday showed heavy damage to the mid-right side of the Navy ship, which appeared to be stationary in the water, and a person in a stretcher being lifted to a helicopter.

The U.S. 7th Fleet said on its Facebook page that it was working with the Japanese Coast Guard to conduct a medical evacuation of a sailor, and that there were currently no reports of deaths. The number of injuries was still being determined.

The Japanese Coast Guard said it received an emergency call from Philippine-registered container ship ACX Crystal at 2:20 a.m. (local time) that it was involved in a collision with USS Fitzgerald at a location about 12 miles southeast of the Irozaki cape.

Coast guard spokesman Yuichi Sugino said patrol ships and aircraft were headed to the scene but said that no further details were immediately available.

The Philippine ship weighs 29,060 tonnes and is 222.6 meters (730 feet) long, the coast guard said.

The Navy said that USS Fitzgerald collided with the merchant ship 56 nautical miles southwest of Yokosuka, Japan, a city south of Tokyo that is home to a major US Naval base. A U.S. defense official said there was flooding in three compartments of Fitzgerald.

The 7th Fleet says the ship experienced flooding in some areas, and it is heading back to Yokosuka.

The Pacific Fleet said the extent of injuries and damage to the Fitzgerald are being determined, and the incident is under investigation.