An armed nuclear missile damaged in its launch silo triggering an accident investigation.

FOX's Jill Nado has details from Washington:

The Air Force says three airmen made maintenance errors and wound up damaging a nuclear missile.

The accident happened back in May of 2014, but the Air Force hadn't released any details until they were pressured by the Associated Press.

The Air Force issuing a statement, saying, "the mistake cost the men their nuclear certification and made them the focus of an investigation."

That missile's been taken from its silo at a launch site run by the 320th missile squadron of the 90th missile wing somewhere in Northeastern Colorado. The Air Force is saying the public was never in danger.

In Washington, Jill Nado, FOX News.