South Korean troops have fired at a passenger jet after mistaking it for a North Korean aircraft.

韩国军队误将一艘喷气式客机当成朝鲜军事飞机而向其开火。

Soldiers on Gyodong island, off South Korea's west coast, fired 99 rifle rounds at the Asiana flight, which was out of range and landed undamaged.

The incident took place early on Friday close to the tense border between the Koreas.

The airliner¹, which had 119 people on board, was descending² at the time to Seoul's Incheon International Airport.

The plane had flown from the south-western Chinese city of Chengdu, an aviation（航空） controller told AFP news agency.

Two marine³ guards fired their K-2 rifles at the civilian⁴ flight, according to South Korea's Yonhap news agency.

"The firing continued about 10 minutes but the plane was too far off the rifle's range and it did not receive any damage," Yonhap quoted an unnamed Marine Corps⁵ official as saying.

"When the plane appeared over Jumun island, soldiers mistook it as a North Korean military aircraft and fired."

The BBC's Lucy Williamson, in Seoul, says the West Sea - which contains the disputed maritime⁶（海事的） border between North and South Korea - has been especially tense since two attacks on South Korea last year.

Relations between the two nations have been frosty ever since, with North Korea recently vowing⁷ to break ties with the South in retaliation⁸（报复，反击） for what it called "psychological warfare⁹" against it.