No threat has been found at a U.S. Air Force base in North Dakota that was locked down for two hours while base officials investigated a domestic violence report from local police.

Lt. James Fisher says police in Grand Forks notified the Grand Forks Air Force Base around 5:30 p.m. Monday about a potential domestic violence incident on base.

The base was then put on lockdown while officials investigated. That meant vehicles weren't being allowed onto the base.

Fisher says the lockdown was lifted around 7:30 p.m. He says officials found "no validity to the initial report" of a domestic violence incident.

He said he could not provide details on what might have prompted that report.