South Korea's military seized a North Korean boat that crossed into its waters on Tuesday and fired a warning shot to see off a North Korean patrol vessel that tried to intervene, Seoul officials said.
South Korea's Yonhap news agency initially described the vessel as a fishing boat, but officials said that had still to be determined.
Seven unarmed sailors were aboard the vessel, but six appeared to be wearing uniforms, a South Korean military official said. During initial questioning, the North Korean sailors claimed that there must have been a "navigating error".
