Two U.S. F-15 fighter planes brushed each other over the sea near Okinawa on Monday, but both returned to base safely and there were no injuries, the U.S. military said.

Both planes, based in Alaska and on a training mission, were damaged in the incident, which took place at around 2:45 p.m. They flew back over water to the U.S. Air Force's Kadena air base in Okinawa to avoid populated areas, the U.S. military said.

The Kadena base straddles the city of Okinawa and the towns of Kadena and Chatan.