Jeremy Corbyn says he was "shocked" by footage apparently showing British paratroopers using his photograph as a target.
An image of the Labour was apparently used as target practice by four soldiers, thought to be based in Kabul, Afghanistan with the 3rd Battalion Parachute Regiment.
The opposition leader said: "I'm shocked, obviously, that this sort of thing has happened.
"I hope the Ministry of Defence will conduct an inquiry into it and find out what was going on and who did that."
The Labour leader went on to refer to death threats received by an MP, Rosie Cooper, he said: "Yes people have disagreements and yes people have divisions.
"Conduct those divisions and disagreements in a respectful way. Don't descend into something ugly and violent."
It is thought the video was first posted on Snapchat but has now been widely shared on other social media platforms.