India, Sept. 20 -- North Korea launched a short-range ballistic missile toward the sea on Sunday, South Korea's military said, two days after the North threatened to bolster its nuclear deterrent capabilities and respond to what it called US hostilities.

South Korea's military said the missile flew about 450 kilometres toward the North's eastern waters.

Hours later, it said the North launched another projectile off its eastern coast but gave no further details as to what type of weapon it was. The South Korean military said it has boosted its surveillance posture and was closely exchanging information on the launch with the United States and Japan.

South Korea's presidential office urged North Korea to immediately halt ballistic missil...