**A South Korean navy ship with about 100 personnel on board is sinking off the west coast near North Korea, possibly due to a torpedo attack, reports say.**The ship was sinking near Baengnyeong island, Yonhap news agency quoted navy officials as saying.
The cause of the incident, which happened late on Friday night local time, was not known, the report said.
A rescue operation is said to be under way. There were no immediate reports of casualties, Yonhap said.