Officers were called to Kingsway Recreation Ground shortly after 6.30pm on Friday following reports of disorder, where “a number of teenagers” were seen “carrying large knives”, Bedfordshire Police said.
A 17-year-old boy was taken to hospital with multiple stab wounds but died a short time later, the force said.
Police said that two boys, arrested on Friday on suspicion of violent disorder, have now been further arrested on suspicion of murder.
One of the suspects is currently in hospital with serious – but not life-threatening – injuries, police said.
The victim has not yet been formally identified.
Police said his family are being supported by officers.
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