While the two Koreas were conducting inter-Korean family reunions, a North Korean military patrol ship crossed the maritime border in the West Sea three times between just before 11 p.m. Monday night and 3 a.m. Tuesday morning.
South Korea's defense ministry announced earlier this Tuesday that the North Korean vessel crossed back and forth beyond the Northern Limit Line, the de facto maritime border between the two Koreas, on three separate occasions, venturing as far as 3-and-a-half kilometers into the zone.
The South Korean military sent high speed patrol boats to the area after warnings were ignored by the North, although there were no skirmishes.
The boat turned back at around two thirty this morning.
The ministry says that it is highly likely that the North sent the boat to the area on purpose, since it ignored warnings and lingered for quite a long time.