An Air Self-Defense Force fighter jet on a training mission mistakenly fired into civilian facilities Monday in Hokkaido, police and the Defense Agency said.

A 20mm practice bullet mistakenly fired by an ASDF fighter jet remains embedded in the parking lot of a rehabilitation center in Katahiroshima, Hokkaido.

Nobody was injured in the mishap, in which 188 rounds were fired from the F-4 Phantom's 20mm cannon.

Some of the 100-gram rounds, 7.7 cm in length and 2 cm in diameter, traveled for 5 km and hit the roofs of buildings at a rehabilitation center in the city of Kitahiroshima, a vehicle in the center's parking lot and a road at a golf course at around 10:55 a.m., police and city officials said.

Police, who confirmed that 13 rounds hit the parking lot and roofs of the center, said the rear window of a car in the lot was shattered.