The US has apologised to Japan over a recent series of accidents involving US military equipment that have sparked anger over American operations in the country, a ministry spokesman in Tokyo said. US Secretary of Defence James Mattis apologised to Japanese counterpart Itsunori Onodera after a string of accidents including the emergency landing of an American military helicopter in Okinawa on Monday.

That came just two days after a similar incident on the southern Japanese island, where more than half the 47,000 American troops in Japan are stationed. "The minister said there was an apology from Secretary Mattis," a Japanese defence ministry spokesman told AFP.

"I told him about the issue, raising concrete examples of various accidents that happened in September, October, November, December last year and January this year in Okinawa," Onodera told reporters after the talks. Onodera has said he hoped to depart for Hawaii as soon as Tuesday to meet top the US commander in the Pacific, Harry Harris, to discuss the issue.

There were no immediate reports of injuries or damage after the helicopter landed near a hotel in the village of Yomitan on Monday.

Copyright Agence France-Presse, 2018