London Borough of Hackney
David Smith, 20, was stopped and searched by Metropolitan Police officers in east London.
Around 80 firefighters were called to the fire on Monday night.
The aspiring musician was stabbed to death in Hackney in May.
A Section 60 order is in place for the whole of Hackney.
Mayor vows anyone caught with a knife would face 'the full force of the law'.
Collins, 25, apprehended by armed police in Rushden, Northants, on Saturday.
The boyfriend of reality TV star Ferne McCann has been charged with 14 counts of wounding with intent to do grievous bodily
'This was a shocking incident that has left the victims extremely shaken.'
Three schoolchildren were abused and spat at in north London in a suspected hate crime, police said on Tuesday. Two 12-year