The U.S.A. Marine Corps has suspended flights of its Osprey aircraft in Japan after one of the planes crash-landed off the coast of Okinawa, injuring five crew members.
The crash triggered protests on Okinawa, where anti-U.S. military sentiment is already strong.
Many Okinawans were opposed to deploying the Osprey on the island due to safety concerns following a string of crashes outside Japan, including one in Hawaii last year.
The Mayor of Nago, Susumu Inamine, said: 'This is what we have feared might happen some day. We can never live safely here.'
More than half of the 50,000 American troops in Japan are stationed on Okinawa under the Japan-US security treaty.