A 19-year-old man has been arrested over the death of a teenager killed in a bakery shop in south-east London.
Detectives believe 16-year-old Jimmy Mizen tried to avoid a fight minutes before he was attacked just 500 yards from his home in Lee on Saturday.
He died from a fatal neck injury from a shard of glass, police said.
The suspect is being questioned by detectives at a police station in London, a spokesman for the Metropolitan Police said.
The attack happened at the Three Cooks Bakery in Burnt Ash Hill on Saturday morning.
Police said Jimmy encountered his attacker after going into the shop with an older brother.
They said his attacker had ordered him to fight outside the shop but the 16-year-old refused.
The youth then smashed glass in the store and delivered a fatal blow to Jimmy's throat, police said.
'Zero tolerance'
Jimmy is the 13th teenager to have been fatally attacked in London since the start of the year.
Figures show 68 people aged under 25 have been killed in London since the beginning of 2007.
On Tuesday London Mayor Boris Johnson said there was a need to "change the mentality" of youths in the wake of the murder.
He said there would be "zero tolerance" to crime and stressed the need to introduce hand-held scanners to detect weapons in the capital.
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