North and South Korea troops exchange fire along border

North and South Korean troops exchanged fire along their tense border on May 3, the South's military said, the first such incident since the rivals took unprecedented steps to lower front-line animosities.

Violent confrontations have occasionally occurred along the border, the world's most heavily fortified. While May 3's incident is a reminder of persistent tensions, it didn't cause any known casualties on either side and is unlikely to escalate, observers say.

The Joint Chiefs of Staff in Seoul said in a statement that North Korean troops fired several bullets at a South Korean guard post inside the border zone. South Korea responded with a total of 20 rounds of warning shots on two occasions before issuing a warning broadcast, it said.

South Korea suffered no casualties, the military said. Defense officials said it's unlikely for North Korea to have any casualties either as the South Korean warning shots were fired at uninhibited North Korean territory. The North's official Korean Central News Agency hasn't reported about the incident.

A preliminary South Korean analysis showed that North Korea's firing wasn't likely a calculated provocation though Seoul will continue examining whether there was any motivation for the action, a South Korean defense official said. He spoke on condition of anonymity, citing department rules.

Farming activities around the North Korean area where the firing occurred continued throughout Sunday and North Korea's military didn't display any other suspicious activities after the gunfire, the official said. He said there was a thick fog in the area at the time of the incident.

Later on May 3, South Korea sent a message to North Korea to try to avoid an escalation, but the North hasn't...