Officers have been given more time to question a man over the fatal shooting of a youth at a supermarket.
Ryan Bravo died in the incident at the Costcutter store in Walworth, south-east London, on Wednesday.
Police said Mr Bravo, 18, of Brixton, was an innocent bystander who had been caught in the line of fire.
A post-mortem examination revealed he died from a single gun shot wound to the back. A 19-year-old is being held at a south London police station.
A Metropolitan Police spokesman said: "A warrant of further detention has been granted for a 19-year-old man arrested in connection with the murder of Ryan Bravo."
Ryan was with family members on Wednesday night when he was shot as two men pushed past him while trying to get away from someone.
'Difficult time'
In a statement, Ryan's family said: "I would like to state that Ryan was a decent, hardworking young man and loving son.
"This is an extremely difficult time for all of us that knew and loved Ryan and I would ask that we are given the time and space to grieve in private."
Det Supt Gary Richardson, from Operation Trident, which tackles gun crime in London's black community, said: "We are keeping an open mind regarding the motive of this murder.
"However, it appears at this stage that the victim has no links to gang activity and that he was an innocent bystander - caught up in the line of fire and was not the intended target."
Officers said Ryan was walking home with his brother and cousin when they stopped in the shop.
"Two other black males barged past them into the shop and the victim was shot in the back," Det Insp Tim Carter said.
"The shots were fired by two men on scooters, who then drove off."
About five men were seen leaving the scene on mopeds.
Police said they have not traced the two men who were the intended target of the attack.
Ryan is the 22nd teenager to die in a shooting or stabbing incident this year.
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