A teen was stabbed to death at a council-run course on knife awareness.
The 18-year-old – named locally as Hakim Sillah – was killed after a fight broke out during the event to teach youths the dangers of carrying blades.
He suffered a critical stab wound and died less than an hour after being airlifted to hospital.
Police were last night questioning a 17-year-old boy in connection with the attack.
They praised the 'amazing' courage of another 17-year-old who was also stabbed after stepping in to break up the fight.
He was taken to hospital for treatment but later discharged.
All three boys were attending the youth offending service session at Hillingdon Civic Centre in Uxbridge, west London, by appointment.
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A Metropolitan Police spokesman said: "The event was a knife awareness course."
Det Chief Insp Noel McHugh, leading the investigation, said as far as he knew attendees were not searched for weapons.
He said: "They were young offenders. They were there by appointment.
"It was a group session and a very quick altercation occurred between two individuals which resulted in one male sustaining a knife injury which would cost him his life.
"My understanding is that it was a council event and there was no screening process.
"But my understanding is that they would have carried out their own risk assessments.
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"During the attack an independent unconnected male tried to intervene and break up the fight and that male sustained a stab injury.
"He has been treated and has since been released from hospital.
"The victim's family are broken, absolutely broken. It doesn't feel real.
"What we can say is that as a result of very quick policing response this individual was traced and arrested and is currently in custody.
"It is not known if they were known to each other.
"We're looking into their lifestyle and their associations.''
Det Chief Insp McHugh said everyone present was "absolutely shocked" and "coming to terms with the loss of such a young life so tragically".
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The weapon has not been found.
Pals said victim Hakim was a keen footballer about to start an apprenticeship to become an electrical engineer.
They described him as a "fun character" and the "joker of the pack" as they laid floral tributes at the scene.
Selina Clarke, 18, who went to secondary school with him, said: "I am more angry it happened in a knife crime meeting and they were so careless not to check.
"For a knife crime to happen inside the building – you would think they would do security checks especially given the people involved in it.
"They cannot have been searched properly otherwise they would have seen the knife.
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"It is so simple to put checks in place like a pat down or a metal detector that could have stopped it.
"We have them in college now and then.
"Why is that not a permanent thing in a building that is going to hold events to stop knife crime? It is just careless.''
Local MP Boris Johnson said the attack was "very sad news".
"My thoughts are with the victim's friends & family,'' he tweeted.
Council officials declined to say what security measures were in place at the event.
A spokesman for Hillingdon Council said: "This matter is being investigated by the police and we are unable to comment further at this time.
"Our thoughts are with the victim’s family.''
- Boris Johnson
- Knife Crime
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