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US Marine helicopter window falls from sky, injures child

A 20-pound window of a US Marine Corps helicopter fell off in mid-flight onto a school playing field Tuesday, slightly injuring a child on the Japanese island of Okinawa, CNN reported.

US Forces Japan said in a statement that the window of a CH-53 transport helicopter fell onto a sports field at an elementary school outside Marine Corps Air Station Futenma.

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"We take this report extremely seriously and are investigating the cause of this incident in close coordination with local authorities," the statement said. "This is a regrettable incident and we apologize for any anxiety it has caused the community."

The child was not seriously injured, CNN reported.