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CCTV images released today show the moment before an innocent teenager is murdered, because his killers mistakenly thought he was a member of a rival gang.
Kwame Ofosu-Asare wasn't.
But he was stabbed to death on a housing estate in Brixton.
Today his killers were jailed for life.
Some of you may be upset by some of the images in this report by Piers Hopkirk.
Nathaniel Okusanya, received a life sentence with a minimum term of 20 years.
Nelson Idiabeta, detained at her majesty's pleasure, received a minimum term 19 years
Passing sentence his honour Judge Marks QC told the two teenagers:
"You have shown not one iota of remorse, both of you seeking to brazen it out in front of a jury."
The court heard that the attack had its roots in a feud between the TN1 (Trust No-One) gang from the Tulse Hill area of south London and Brixton-based GAS (Guns and Shanks).
Idiabeta and Okusanya were members of the TN1 group out to avenge one of their number who had been stabbed in a bus garage attack carried out by the GAS gang earlier in the day.
Kwame's father Kwaku, a sports journalist, told the court in a statement that his son was full of potential.
He was in the sixth form of Forest Hill School and excelled in sport, music and acting and was ambitious.
Mr Ofosu-Asare said: "Kwame was a very vibrant, energetic and enthusiastic boy.
"His brother and sister are struggling to cope with his death. All our lives have been ruined."
He added that Kwame was not a member of either gang. He had been to a recording studio in the area.
Kwame was stabbed repeatedly in the back and received a total of 14 wounds while walking in Adelaide Close with a friend.
The killers tried to get away by going into a side road where the friend's aunt lived, but the aunt was not home and they were trapped in a cul de sac.
Two teenagers have been given life terms for murdering an innocent schoolboy.
Kwame Ofosu-Asare, 17, was mistaken for a rival in a "poisonous and senseless" gang war.
He was knifed to death in broad daylight while he was walking with a friend through the Moorlands Estate in Brixton, in March.
Nelson Idiabeta, 18, of no fixed address, and Nathaniel Okusanya, 19, of Vibart Gardens, Lambeth, south London, were found guilty of murder.
Sentencing them at the Old Bailey, Judge Richard Marks ordered that Idiabeta serve a minimum term of 19 years and Okusanya, 20 years.