A U.S. Army helicopter crashed while landing on a Navy ship Wednesday off Japan's southern island of Okinawa, injuring seven people and damaging the aircraft, officials said.
The H-60 helicopter made a hard landing on the USNS Red Cloud cargo vessel around 20 miles (30 kilometers) east of Okinawa, U.S. Forces Japan said in a statement, adding that the cause was under investigation. Okinawa is home to most of the tens of thousands of U.S. troops in Japan.
The injured were transported to a Navy hospital, the statement said. Their conditions were not immediately clear.
The other 10 people aboard the helicopter were not hurt, said Japanese coast guard spokesman Shinya Terada.
Japanese national broadcaster NHK showed video of the helicopter sitting on the cargo ship, with its tail broken off and its body partly covered with an orange tarp.
The presence of so many U.S. troops on Okinawa — more than half of about 50,000 American troops in Japan — has been a source of friction and Okinawans have long complained about crime, accidents and noise from the U.S. bases.
A plan formulated in 1996 between the Japanese and American governments would move U.S. Marine Air Station Futenma from a populated neighborhood to a less developed area, but Okinawans want the Marine base moved off the island altogether.
Wednesday's accident coincided with Japanese Chief Cabinet Secretary Yoshihide Suga's visit to the island for talks with Okinawa Gov. Takeshi Onaga, a vocal opponent of the relocation plan.
"For those who live near (U.S.) bases, it's a serious matter," he said at the outset of the talks, reminding Suga of Okinawa's burden and risk of accommodating the U.S. military bases.
Onaga has threatened to revoke an approval for reclamation work to build an off-shore runway in the area called Henoko.
Suga called the helicopter accident "extremely regrettable," and told reporters that he has lodged a protest to the U.S. military over it, asking for prompt information disclosure, thorough investigation and implementing preventive measures.