http://www.foxnews.com/story/0,2933,522062,00.html

SEOUL, South Korea — There are unconfirmed reports that North Korea has launched another missile, its third since conducting a nuclear test Monday, Pentagon sources tell FOX News.

A South Korean presidential official told South Korean media that a short-range missile was fired from North Korea's east coast into the Sea of Japan, according to a Sky News report.

Earlier Tuesday, North Korea test-fired two short-range missiles from the east coast city of Hamhung, according to South Korea's Yonhap news agency. South Korea's spy chief said two other missiles were launched Monday, and North Korea also warned ships to stay away from waters off its west coast through Wednesday, suggesting more test flights.

U.S. officials were concerned that more tests could be on the way after the North Korean government issued a travel advisory to ships traveling off its coast that is in effect until Wednesday.

The missile launches came as leaders around the world condemned North Korea for Monday's underground nuclear test. Retaliatory options were limited, however, and no one was talking publicly about military action.