A U.S. Army Apache helicopter crashed in South Korea on Monday, killing two pilots, the U.S. Army in South Korea said in an emailed statement to NBC News.
The pair were the only people aboard the AH-64 Apache that came down 50 miles east of Camp Humphreys, the statement said.
It was not immediately clear what caused the crash in Wonju. According to South Korean news agency Yonhap, authorities there believe the chopper may have hit high voltage power lines or a "steel tower," perhaps referring to an electricity pylon.
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The the pilots' identities were not released.
U.S. has about 28,500 troops stationed in South Korea, according to Reuters.