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He admitted he had told the FBI that Pratt had a submachine gun.

A professor also showed BBC Panorama how he found someone within moments on Telegram who offered to ship an Uzi submachine gun to the UK for £850.

Police said they were searching for the two attackers, who they said had exited the vehicle with a submachine gun and fled the scene.

The UN fact finding mission said the authorities used shotguns, assault rifles and submachine guns against demonstrators, "thereby committing unlawful and extrajudicial killings."

To carry out his plans, Wischhusen compiled an armoury of homemade weapons including pistols, submachine guns and a shotgun, as well as ammunition, bombs, grenades and poison.