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The London Assembly is urging the Home Secretary to refuse the Mayor's request for a water cannon licence.
Colin Simpson Water cannons are used in Northern Ireland whenever there's rioting - as Northern Ireland is part of the UK, if it's not allowed to be used in London, then the same should apply for Northern Ireland.
Liberal Democrat Assembly member Caroline Pidgeon says the Mayor reached his decision today despite not reading the Police and Crime Committee report.
The Met is planning to buy three second hand water cannon from German police at an estimated cost of £200,000.
Speaking this morning, Boris Johnson said: "I have concluded there is broad support amongst Londoners for the use of this measure by the police in limited circumstances."
The majority of the 25 Assembly members - including Conservatives - are opposed to water cannon.
Boris Johnson confirmed today he made a formal request to the Home Secretary to arm the Met police with water cannon.
But London Assembly members reacted with anger after the mayor admitted he hasn't read their report.
Latest ITV News reports
The Mayor has written to Home Secretary saying he supports the anti-riot measure. The move has infuriated members of the London Assembly.