Seongju County

The United States military started installing a controversial antimissile defense system in South Korea overnight Tuesday, triggering protests and sparking criticism that it was rushing to get the battery in place before the likely election of a president who opposes it.

Two huge U.S. bombers flew over South Korea on Sept. 13 in a show of force against the North as a top U.S. envoy said China must help close loopholes in sanctions following Pyongyang's largest-ever nuclear test.

The supersonic B-1B Lancers reached airspace over the U.S. Osan Air Base at Pyeongtaek, 64 kilometers south of Seoul, at around 10 a.m.