A veteran UFO investigator has claimed that UFOs have visited America's nuclear weapons sites since the dawn of the atomic age — and he believes these intruders may have the power to 'neutralize' such weapons.

Robert Spearing is an investigator for the Mutual UFO Network (MUFON), which has 700 investigators in the US and is one of the world's oldest UFO organizations, having collected evidence of suspected extraterrestrial encounters since the 1960s.

Spearing said that among MUFON's files — and the organization has nearly 137,000 reports on UFO encounters from the US and around the world — there are multiple cases alleging alien visitors hovering above nuclear bases and nuclear-armed ships.

'There is enough evidence that the visitors have the ability to neutralize their use,' as Spearing told DailyMail.com.

'The question is whether it is for defensive purposes or offensive purposes,' according to Spearing. 'It's either to save us from ourselves or to ensure they could destroy us if they had to.'

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