WASHINGTON (Reuters) - North Korea may be preparing an underground test for a nuclear bomb, ABC News said on Thursday, citing unidentified U.S. officials.

It quoted a senior military official as saying a U.S. intelligence agency had recently observed "suspicious vehicle movement" at a suspected North Korean test site.

A senior State Department official told the network: "It is the view of the intelligence community that a test is a real possibility."

Asked about the report, a senior U.S. official told Reuters: "We have no new evidence to support that."