Pictured: Man, 20, stabbed to death at skate park in Northampton

Mason Miller was killed and a 17-year-old boy was taken to hospital with life-threatening injuries after an incident at a park in Ringway, in the Briar Hill area, on Wednesday.

Emergency services were called to the scene at around 3.45pm following reports two people had been stabbed “during an altercation”.

The force said the teenager remains under treatment in hospital.Senior investigating officer Detective Inspector Matt Bly, of the East Midlands special operations unit (EMSOU), said: “This remains a murder investigation and our thoughts first and foremost remain with Mason’s family at this difficult time.

“The family understandably are still trying to come to terms with Wednesday’s tragic events and, as such, have asked for complete privacy at this time.

“We are continuing to work across a number of fronts to piece together what happened and to determine who is responsible.

Read more: Four arrested as man dead and boy fighting for life after double stabbing at skate park

Read more: Boy, 16, charged with murder after 18-year-old stabbed to death in west London street

“The public’s co-operation will be key to this and I would urge anyone with information to come forward – including CCTV, doorbell or mobile phone footage – to contact the force as a matter of urgency.”

Officers have been carrying out house-to-house inquiries since the incident and there has been an increased police presence in the area, the force said.

Mr Bly said the investigation has been fast-moving with a number of lines of inquiry being pursued by detectives.

The force said that as part of the wider police investigation, two 15-year-old boys and a 14-year-old youth appeared at Northampton Magistrates Court yesterday on Saturday, charged with violent disorder and possession of an offensive weaponThey were granted conditional bail and placed into the care of the local authority.