Two Japanese navy helicopters carrying eight crew members crashed in the Pacific Ocean south of Tokyo during a nighttime training flight after possibly colliding with each other, the country's defense minister said Sunday. One crew member who had been recovered from the waters was later pronounced dead, while rescuers searched for seven others who were still missing.

The two SH-60K choppers from the Maritime Self Defense Force were carrying four crew each and lost contact late Saturday near Torishima Island about 370 miles south of Tokyo, Defense Minister Minoru Kihara told reporters.

The cause of the crash was not immediately known, but the two helicopters might have collided with each other before crashing into the water, Kihara said.

Rescuers have recovered a flight data recorder, a blade from each helicopter, and fragments believed to be from both choppers in the same area, signs that the two SH-60Ks were flying close to each other, Kihara said. Officials will analyze the flight data to try to determine what led to the crash.

The MSDF deployed eight warships and five aircraft for the search and rescue of the missing crew.

The helicopters, twin-engine, multi-mission aircraft developed by Sikorsky and known as Seahawks, were modified and produced in Japan by Mitsubishi Heavy Industries. They were on nighttime anti-submarine training in the waters, Kihara said. One lost contact at 10:38 p.m. local time Saturday and sent an automatic emergency signal a minute later.

Only one distress call was heard — another sign the two helicopters were near the same place, because their signals use the same frequency and could not be differentiated, Kihara said.

One belonged to an air base in Nagasaki, and the other to a base in Tokushima prefecture.

The SH-60K aircraft is usually deployed on destroyers for anti-submarine missions.

Saturday's training only involved the Japanese navy and was not part of a multinational exercise, defense officials said. They said no foreign aircraft or warships were spotted in the area.

Japan, under its 2022 security strategy, has been accelerating its military buildup and fortifying deterrence in the southwestern Japanese islands in the Pacific and East China Sea to counter threats from China's increasingly assertive military activities. Japan in recent years has conducted its own extensive naval exercises as well as joint drills with its ally the United States and other partners.

Saturday's crash comes a year after a Ground Self-Defense Force UH-60 Blackhawk crashed off the southwestern Japanese island of Miyako, leaving all 10 crew members dead. In January 2022, a Air Self-Defense F-15 fighter jet crashed off the northcentral coast of Japan, killing two crew.

Japan's NHK public television said no weather advisories were issued in the area at the time of Saturday's crash.

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