SEOUL, South Korea (AP) — South Korea’s navy has fired warning shots to chase away two North Korean ships after they briefly crossed a disputed western sea boundary.

Seoul’s Defense Ministry says the two ships — one military vessel and the other a fishing boat — were in South Korean-controlled waters for less than 10 minutes Friday morning.

It says a South Korean navy ship fired five rounds of warning shots after broadcasting a warning. There were no reports of injuries and damage to the ships of either side.

This kind of incident isn’t unusual, with fishing boats jostling for positions in the waters teeming with crab and other seafood.

The two Koreas have fought three deadly naval skirmishes in the area since 1999.

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