A U.S. military official apologized Monday to an elementary school in Okinawa where a CH-53E helicopter window almost fell on children last week, while the governor blasted U.S. plans to announce the resumption of flights of that type of chopper later in the day.

The official also told the school that the U.S. military had reconsidered flight rules at Marine Corps Air Station Futenma, where the chopper took off from, and confirmed it would make every effort not to overfly the school.

No one was injured when the metal-framed window landed on school property near the base last Wednesday, but the latest accident stoked local anger about the large U.S. military presence on the island.