London (CNN) The British Army has opened an investigation into a video circulating on social media that appears to show serving soldiers shooting at a picture of Jeremy Corbyn, the leader of the UK's opposition Labour Party.

The 25-second video, initially shared on Snapchat with the caption "Happy with that," appears to show four men in military uniform firing handguns at a large image of Corbyn during target practice.

It is not clear whether the video has been manipulated.

The army is investigating the video.

"We are aware of a video circulating on social media, this behaviour is totally unacceptable and falls well below the high standards the Army expects, a full investigation has been launched," an Army spokesman told CNN in a statement.

The UK's Press Association news agency said the footage was captured in Kabul, Afghanistan in recent days and showed the 3rd Battalion Parachute Regiment engaged in target practice on a simulation range.

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