Officials said Saturday that South Korean troops fired at a passenger plane carrying 119 passengers and crew, thinking it was a North Korean warplane.

Two Marine guards on Gyodong island off the western coast of South Korea fired their K-2 rifles at the ASIANA plane as it descended for landing Friday at Seoul's Incheon airport.

The passenger liner was on a flight from China and was undamaged, because it was out of range of the rifles.

Officials say the firing lasted about 10 minutes, with the guards discharging around 99 shots.