A man who was stabbed to death by a group of teenagers police suspect were as young as 13 has been named as Christopher John Barry.
Barry - also known as Jack - was knifed to death after an argument with a group of teenagers at the entrance of a block of flats in the Edmonton neighbourhood of Enfield, north London.
The 53-year-old was with a woman when two of the youths followed him in to the block where he was stabbed.
A 13-year-old remains in police custody on suspicion of murder. Three other boys aged 14 and 15 have been released on bail.
Detective Chief Inspector Neale Baldock of the Homicide and Major Crime Command leads the investigation. He said: "Our initial enquiries have established that there was a supervised party taking place at another address within the block and the group of males were trying to gain access to this.
"The victim and this group were not known to each other - what started as a minor verbal altercation has escalated into a shocking act of violence."