A photo provided to ITV News by a witness shows the moment that the convicted robber known as the 'Skull Cracker' was detained by police officers in east London.
Police had been searching for Michael Wheatley after he failed to return to an open prison in Kent after being released on temporary licence.
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Tony Davis was the first civilian to reach Pc Palmer after he was stabbed during the Westminster attack.
Defiant Londoners put on a show of solidarity for the victims of the Westminster terror attack at a vigil in their honour.