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The machine, which looks like a mini plane with wings, is placed on a launchpad, stretched like an arrow on a crossbow and then shot into the air.

"Clifford has again shown himself to be a coward. Clifford armed himself with a crossbow and knife in order to attack three innocent women," he said.

A Labour MP has said tightening the law around crossbow sales is "important" as an ex-soldier who murdered a woman and her two daughters awaits sentence.

The trial heard that in the days leading up to the murders, Clifford bought a crossbow online, and a replica Glock air pistol from a shop in Essex.

The force took the unusual step of telling the public Clifford was believed to have a crossbow, and made a direct appeal to him.