North Korea opens fire at South Korea
Tensions escalated along the North Korea-South Korea border on Friday after the North fired two rounds at its southern neighbour.
South Korean troops immediately fired back, an official told The Associated Press.
The shots from North Korea were fired towards a South Korean guard post in the Demilitarized Zone between the two countries, an official at the Joint Chiefs of Staff in Seoul told AP.
No one was injured and it wasn't clear whether the shots represented a military action or were an accident.
However the shots came just hours after the North vowed to retaliate after the South rejected a Pyongyang proposal for military talks.