FILE PHOTO: A North Korean flag flies on a mast at the Permanent Mission of North Korea in Geneva October 2, 2014. REUTERS/Denis Balibouse/File Photo

WASHINGTON (Reuters) - North Korea has fired an unidentified ballistic missile, U.S. officials told Reuters on Tuesday on condition of anonymity, without immediately offering further details.

The launch would be North Korea’s first since it fired a missile over Japan in mid-September.