U.S. and Japanese officials say a U.S. Air Force helicopter has crashed on Japan's southern island chain of Okinawa.

美国和日本官员说，美国空军的一架直升机在日本南部冲绳岛坠毁。

Authorities say the crash took place Monday afternoon at a training ground near the U.S. Marine's Camp Hansen in central Okinawa.

有关当局说，坠机事件星期一下午发生在位于冲绳中部的美国海军陆战队汉森营地的训练场附近。

Video footage showed black smoke rising from a fire in a forested area.

录像显示失事的森林地区有一处起火，冒着黑烟。

There is no information about casualties on the aircraft or on the ground.

目前还没有关于机组人员以及地面人员的伤亡的消息。