Ryan Bravo is the 22nd teenager killed violently in London this year
A teenager shot dead in a supermarket was an innocent bystander caught in the line of fire, police have said.
Ryan Bravo, 18, from Brixton, south London, was killed in the Costcutter store in Walworth, south-east London, on Wednesday night.
A post-mortem examination revealed the teenager died from a single gun shot wound to the back.
A 19-year-old man has been arrested over the shooting and is being held at a south London police station.
Ryan was with family members when he was shot as two men barged past him while trying to get away from someone.
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."
Investigating officer Det Insp Tim Carter has appealed for witnesses.
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.
A number of people were seen leaving the area on mopeds
A man in his 20s said he was in the shop when the incident took place.
He said: "I was buying cigarettes when four or five guys ran in.
"I didn't think anything bad was going to happen because I thought they were joking and laughing.
"But then I heard shots, three or four. I've never seen anyone get shot before - it was like something out of a film.
"I just put all of my stuff down and ran out of the shop. A hysterical lady ran out after me. I'm lucky to be alive."
Forensic experts have examined what appear to be two bullet holes in the glass lower panels of a public telephone box.
The phone box, which is in front of a neighbouring carpet store, has been cordoned off by police.
Police revealed that an earlier shooting, which may be connected, took place on Brixton's Myatts Field North Estate at about 1630 BST.
Ryan is the 22nd teenager to die in a shooting or stabbing incident this year.