Metropolitan Police Commissioner Sir Mark Rowley says he is “shocked and frustrated” at a planned protest in support of Palestine Action.
The demonstration, due to take place in Westminster later, comes as the government moves to ban the group under anti-terror laws.
Activists from Palestine Action hit the headlines last week after targeting RAF Brize Norton and damaging two military aircraft in a significant security breach.
Home Secretary Yvette Cooper will update MPs on the move to proscribe the organisation, which would make it a criminal offence to belong to or support it.
Sir Mark said that – until this happens – the force has “no power in law” to prevent the protest from taking place, but lawbreakers will be “dealt with robustly”.
He added: “This is an organised extremist criminal group, whose proscription as terrorists is being actively considered.
“Members are alleged to have caused millions of pounds of criminal damage, assaulted a police officer with a sledgehammer and last week claimed responsibility for breaking into an airbase and damaging aircraft.
“Multiple members of the group are awaiting trial accused of serious offences.”
He added that – while the right to protest is essential – “actions in support of such a group go beyond what most would see as a legitimate protest”.
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Trump’s golf course in Ayrshire was vandalised by Palestine Action. Pic: PA
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