A window from a US military helicopter fell onto a school sports ground in southern Japan Wednesday, the marines said, apologising for a &quot;regrettable&quot; incident likely to fuel opposition to their presence.&nbsp;There were no immediate reports of injuries from the accident that took place at 10:09 am (0109 GMT) local time at an elementary school near the Futenma marine airbase.

The US military said it was taking the incident &quot;extremely seriously&quot; and was opening an investigation.&nbsp;&quot;This is a regrettable incident and we apologise for any anxiety it has caused the community&quot;, the military added in a statement, urging local residents to stay clear from where the object landed &quot;for safety purposes&quot;.

The incident comes just two months after an American military chopper burst into flames after landing in an empty field in Okinawa.&nbsp;Such accidents have sparked opposition to the US bases on the strategic island, which would be a launchpad for any American military activity in Asia.

&quot;This kind of incident causes worries among not only people at the school but all the people in Okinawa and should never happen&quot;, said chief Japanese government spokesman Yoshihide Suga.&nbsp;The Futenma airbase is already a major source of mistrust between Japan&#39;s central government and Okinawa over a wider US military relocation programme signed between Tokyo and Washington in 1996.

Residents want Futenma to be closed and a replacement built elsewhere in another part of Japan or overseas, saying they can no longer live with the noise pollution, accidents and occasional crimes committed by US service members.&nbsp;

A local official in the city of Ginowan in Okinawa told AFP that officials were trying to confirm a report that a school child was somehow lightly injured due to the incident.

An investigation has been opened as a window from a US military helicopter fell down on a sports ground of an elementary school in Japan

A window from a US military helicopter fell onto a school sports ground in southern Japan Wednesday, the marines said, apologising for a "regrettable" incident likely to fuel opposition to their presence. There were no immediate reports of injuries from the accident that took place at 10:09 am (0109 GMT) local time at an elementary school near the Futenma marine airbase. The US military said it was taking the incident "extremely seriously" and was opening an investigation. "This is a regrettable incident and we apologise for any anxiety it has caused the community", the military added in a statement, urging local residents to stay clear from where the object landed "for safety purposes". The incident comes just two months after an American military chopper burst into flames after landing in an empty field in Okinawa. Such accidents have sparked opposition to the US bases on the strategic island, which would be a launchpad for any American military activity in Asia. "This kind of incident causes worries among not only people at the school but all the people in Okinawa and should never happen", said chief Japanese government spokesman Yoshihide Suga. The Futenma airbase is already a major source of mistrust between Japan's central government and Okinawa over a wider US military relocation programme signed between Tokyo and Washington in 1996. Residents want Futenma to be closed and a replacement built elsewhere in another part of Japan or overseas, saying they can no longer live with the noise pollution, accidents and occasional crimes committed by US service members. A local official in the city of Ginowan in Okinawa told AFP that officials were trying to confirm a report that a school child was somehow lightly injured due to the incident.

US military chopper window falls on Japan school: Military

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US military chopper window falls on Japan school: Military