L (AFP) - South Korea's armed forces ordered a border alert Saturday after North Korea's military threatened an "all-out confrontational posture" against Seoul. The Joint Chiefs of Staff ordered an intensified guard by the army, navy and air force and called for increased reconnaissance flights by spy planes, a spokesman for the joint chiefs told AFP. President Lee Myung-Bak was briefed at an emergency meeting on the North's statement, officials were quoted by Yonhap news agency as saying.