The heartbroken father of a young knife crime victim has sent a plea to Britain's youth to "put down your weapons" as his killer was jailed for 15 years.
Convicted robber Kamal Hussain stabbed 25-year-old Zahir Visiter before hiding in Regent's Park mosque with his friend Yosef Ahmed.
The incident on March 28 sparked an armed raid on the Central London Mosque as the suspects evaded police.
Following a trial at the Old Bailey, Hussain, 22, was cleared of murder but convicted of manslaughter. His co-defendant was acquitted of both offences.
The court heard how Hussain had convictions dating back to when he was aged 12, including four robberies and two offences of carrying a knife in public.
Mr Visiter's father Leo issued a plea to end the "futile battle" on the streets of Britain.
In a statement read to court, he said:
He said crimes like these should be "taken seriously today", but added:
Judge Mark Dennis QC found Hussain to be a dangerous offender as he sentenced him to 15 years in prison and a further two years on extended licence.
He dismissed the defendant's claim he acted in self defence and stabbed Mr Visiter by accident as "false", saying he had carried the knife for a "deliberate confrontation".
The judge commended Mr Visiter's parents for the dignity they showed throughout the trial.
While the motive was unclear, the judge said drug dealing may have been an underlying factor.
The trial had heard how the defendants were chased by two plain-clothes officers down the canal by the Lisson Green estate after the stabbing.
They then disappeared in the golden domed mosque, which accommodates more than 5,000 worshippers.
Jurors at the Old Bailey saw CCTV footage of the pair as they took refuge and changed out of their distinctive hoodies.
They were spoken to by police as the mosque was stormed by officers, but were let go because their descriptions did not match, the court was told.
The defendants, from north-west London, were arrested together at the same address on April 3.