The Okinawa Prefecture Assembly on Thursday unanimously adopted a resolution demanding the suspension of flights and drills by U.S. military aircraft over schools and hospitals, after a window fell from an American helicopter onto school grounds last week.

The resolution issued to protest against the incident said, "No more threat to the lives of people in Okinawa should be tolerated," after a window fell from a CH-53E transport helicopter onto the playground of an elementary school adjacent to U.S. Marine Corps Air Station Futenma in the city of Ginowan.

A slew of similar resolutions have been adopted by individual municipal assemblies in the southern island prefecture, protesting the accident that saw the roughly 90-square-centimeter metal-framed window weighing 7.7 kilograms drop into the playground of Futenma No. 2 elementary school, where 54 pupils were participating in physical education activities.