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Royal Gibraltar Police confirmed the clip shows a "Guardia Civil officer point a gun" and are "seeking clarification" over the clip which has everged this evening.

The WhatsApp video appears to show the Spanish cop pointing a handgun and giving orders – while the shocked cameraman remarks "I have never seen this before in my life".

Gibraltar’s Chief Minister Fabian Picardo said the government is probing the footage amid tensions between Britain and Spain over the Rock.

The minister tweeted: "@GibraltarGov has been sent a video of an apparent firearms incident at the frontier. We are seeking details of the incident."

Britain and Spain are descending into a diplomatic row over the Rock amid the Brexit negotiations with the EU.

The tensions comes after Brussels was accused of plotting to use Gibraltar as a bargaining chip following the triggering of Article 50.

(Image: TWITTER) (Image: TWITTER)

A man named Jeremy Nicholas Sanchez has posted on Facebook claiming to have shot the video.

He said the incident happened today and an "elderly man was forced to step out of his car".

Mr Sanchez added the vehicle as a Spanish registered car.

(Image: GETTY)

In a statement, the Royal Gibraltar Police said: "It is filmed at the border and shows a Guardia Civil officer pointing a gun.

“We cannot confirm that this occurred today. We are seeking clarification of the incident.”

Yesterday, a Spanish warship "illegally" sailed into British waters around Gibraltar before the corvette was chased off by the Royal Navy.

Confrontations have been rising after top Tory Lord Howard suggested Prime Minster Theresa May may got to war over the Rock.

However, Mrs May played down the threat of military conflict and said she would "sitting down and talking to them" about the situation.

The rocky British outpost on Spain’s southern tip has been part of the UK since 1713.

There was fury as the EU proposed to give Spain a veto over any decision about the overseas territory in Brexit negotiations.