WATCH: Police release video of Reece Tansey's killers chasing him down Bolton street

The footage was released after a 16-year-old boy and a 15-year-old boy, who cannot be named for legal reasons, were today jailed for causing Reece's death at a sentencing that followed a five week trial last autumn.

It shows the two boys chasing Reece down Walker Avenue in Great Lever, Bolton, where they had arranged a fight via Snapchat messages.

Detective Inspector Nicola McCulloch, of GMPs Major Incident Team, said: "Reece's murder was a terribly traumatic incident which shocked the entire local community including the students and staff of the school that Reece attended.

"This was a completely mindless and callous act of violence from two such young boys who have left a family devastated by the loss of Reece at only 15-years-old. Our thoughts are very much with Reece's loved ones today and I hope this verdict brings some peace for them in that justice has now been served."

Following todays sentencing, the 16-year-old was jailed for 15 years after being found guilty of murder, while the 15-year-old was jailed for six years for manslaughter.

Police officers have now urged parents and carers to speak to young people about knife crime.

Inspector Paul Nolan, from GMPs Violence Reduction Unit, said: "This is the first time that the VRU have worked on an active murder investigation and we have been working closely with the local authority, as well as with local schools and colleges in Bolton to educate young people on the impact knives can have not just on individuals, but on families and communities.

"We are committed to reducing violent crime, and prevention in this case is key.

"Following the tragic murder of Reece, I'd like to take this opportunity to urge parents and carers to speak to other young people about the dangers of knife crime and how one wrong decision can ruin multiple lives.

"Good friends can also prevent knife crime from occurring so please look out for each other."