North Korea launched several ballistic missiles on Sunday, South Korea's military has said, after international experts warned Pyongyang has made rapid advances in its nuclear weapons development. Seoul's top military officials said North Korea had launched the short-range ballistic missiles from the coastal city of Sinpho at roughly 6:10 a.m. local time. Sinpho is home to major North Korean ballistic missile sites, and is a location for the construction of submarines able to launch the weapons.