U.S. carrier arrives in South Korea as North unveils new warheads

BUSAN, South Korea -- A South Korean navy brass band welcomed about 5,000 crew members from a U.S. aircraft carrier, as the hulking vessel docked at a military port on Tuesday, in a demonstration of strength by the allies as North Korea escalates its nuclear saber rattling.

The U.S. Navy's Carrier Strike Group 11, led by its flagship, the aircraft carrier USS Nimitz, arrived in this southeastern city after conducting joint drills with its South Korean counterpart. Hours earlier, Pyongyang unveiled new, smaller nuclear warheads that experts say can be mounted on short-range ballistic and cruise missiles targeting South Korea.