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However, POA chairman Mark Fairhurst told the BBC he did not believe a trial was necessary and called for their use to be rolled out "before one of my members is murdered".

The POA will also renew calls for all staff to have stab vests.

The warning came as the POA told the BBC it was writing to Prime Minister Sir Keir Starmer to request better security for its members.

Mark Fairhurst, national chairman of the POA, called on the government to "restrict and remove cooking facilities from separation centres" following Saturday's attack.

The POA said the officers sustained injuries including burns, scalds and stab wounds, as they outlined that Abedi threw hot cooking oil over them and used "home made weapons" to stab them.