Ten North Korean ships, including a patrol boat, briefly violated the western sea border with South Korea on Sunday, according to AP reports.
The North's patrol boat crossed the frontier as it tried to usher back nine small boats that strayed into South Korean waters. It wasn't clear why the nine boats crossed the border, according to the report.
North Korean boats periodically enter waters controlled by South Korea, and South Korean navy ships
occasionally respond with warning shots. The navies of the two Koreas fought deadly skirmishes in the western sea in 1999 and 2002.
Source: Associated Press