 Dwaine was stabbed during a dispute near a Tesco store |
A fourth person has been arrested over the death of an 18-year-old who was killed in a street fight. Dwaine Douglas, from Tulse Hill, south London, was stabbed during a row involving a "number of males" on Friday night, police said.
He was taken to hospital after the attack in Thornton Heath, south London, but later died.
A 23-year-old man was arrested on Tuesday. Two 16-year-old boys and a 19-year-old were bailed until June.
Police said the dispute occurred near the Tesco store in Brigstock Road at about 2200 BST.
Det Ch Insp Phil Adams said: "We are appealing for anyone who may have witnessed the fight or anyone who has any information to call police.
"We are not linking this murder with any other recent murders in south London.
"I am keeping an open mind as to the motive for the killing but I do not believe it to be related to inter gang rivalry."
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