SEOUL: South Korea and the Democratic People's Republic of Korea (DPRK) clashed in naval coast off west coast of the peninsula in the morning of Tuesday, South Korea's Yonhap News Agency said, quoting its government source.

According to the Yonhap, a DPRK patrol ship crossed South Korea' s Northern Limit Line (NLL), leading the South Korean Navy to fire warning shots.

The DPRK side is reported to have responded with countering shots, Yonhap added.

"We're still trying to find out if there were any casualties," the source was quoted as saying.

No South Korean casualties have immediately been reported, the official added.