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Four men have been arrested as part of an investigation into the murder of a father-of-two in Northampton.

Jon Casey, 35, of Ecton Brook, was stabbed in Barrack Road, near an Indian restaurant, on 16 January.

Four men, aged 18, 19 and two aged 20, were arrested in Coventry early on Wednesday on suspicion of assisting an offender.

A 19-year-old man arrested on suspicion of murder on 22 January remains on bail pending further enquiries.

Northamptonshire Police are continuing to appeal for anyone with information to come forward.

Det Insp Mark Brayfield, said: "We believe Mr Casey had been involved in an altercation with two men shortly before he was found in Barrack Road."

He said police would like to talk to a woman who was pushing a buggy in Hester Street at 17:15 GMT on the day of the murder.

She is believed to have had a brief conversation with the offenders.