Detectives are offering a £20,000 reward for information leading to the arrest of the killers of a Camden schoolboy who was stabbed to death at a party.

Shaquan Sammy-Plummer, 17, was a sixth form pupil at La Sainte Union School (LSU), Dartmouth Park, when he was knifed in the chest during a fight at a party in Enfield on January 30.

His friends battled to save him until an ambulance arrived, which took him to the Royal London Hospital in a critical condition where he died a short while later.

A post-mortem gave cause of death as a single stab wound to the chest.

Shaquan, who lived in Islington. was a student at La Swap sixth-form consortium but was based at La Sainte Union.

The school, in Highgate Road, offered counselling to pupils in the aftermath of his death.

Detectives were this week handing out leaflets at the scene of the crime in Berkeley Gardens and announced the substantial reward for any information leading to the arrest and prosecution of those responsible.

Det Ch Insp Jamie Piscopo, from the Homicide and Major Crime Command, said: “It is believed Shaquan was with two friends when he became involved in some kind of altercation that resulted in him being stabbed in the chest.

“His friends tried to help him along with local residents but his injuries were too severe.

“We still don’t know what the altercation was about and we hope the offer of £20,000 may encourage someone with information, no matter how small, to come forward.

“Were you in Berkeley Gardens that night? Did you see or hear anything suspicious? Have you heard talk since about what happened to Shaquan? Please contact us.”

Nine people have been arrested in connection with the investigation so far. Four have been released with no further action and five remain on bail until the end of September pending further enquiries.

Shaquan’s mother Jessica Plummer said: “I would be very grateful if the people that witnessed my son’s murder could come forward to provide the police with information to bring those responsible to justice.”

Anyone with information is asked to call the incident room on 020 8345 3775 or Crimestoppers anonymously on 0800 555 111.