Detectives investigating the murder of Mohammed Hussein in Edmonton on Monday 1 April have made a third arrest.
A 19 year old man has been arrested on suspicion of murder and is currently in custody at an east London police station.
Two men have been charged previously.
20 year old Natneal Tefsay of Park Road and Christopher Aluma, 18, of Foxglove Close appeared at Highbury Corner Magistrates' Court on yesterday charged with the murder of Mr Hussein.
They were remanded in custody to the Old Bailey on Tuesday, 9 April.
More top news
"I do not accept the allegation that I have brought the Labour Party into disrepute", said Livingstone.
Family and friends of the victims of Grenfell Tower have been paying tribute to those who perished in the disaster.
The balmy conditions have swept in on a high pressure system, dragging in hot air from the continent, according to the Met Office.