Scotland Yard
A 25-year-old man has been taken to a central London police station.
The family of a woman reported missing have been informed.
The suspected stowaway landed one metre from a man sunbathing in his back garden in Clapham, a neighbour says.
It comes as four males aged 15 to 18 were held on Friday following the attack on May 30, Scotland Yard said.
Shadow attorney general Shami Chakrabarti said a senior Scotland Yard officer should ‘remember his constitutional role’.
"We do not consider that a criminal threshold has been met."
Scotland Yard has confirmed the force received an allegation in relation to the tweet.
The mosque’s imam urged people not to speculate over the gunman’s motives.
