A 15-year-old boy and three other people have been arrested after a man died following an attack in Hertfordshire.
Police were called to an address in Stevenage at 9.15pm on Friday in relation to concerns for the welfare of a 31-year-old man.
Paramedics took the unnamed man from the local area to Lister Hospital where he was pronounced dead shortly after arrival.
A 16-year-old boy was arrested on suspicion of murder on Saturday and remains in custody, Hertfordshire Police said.
Two other boys, aged 15 and 17, and a 41-year-old man were arrested on Sunday in connection with the incident.
Detective Inspector Justine Jenkins, from the Bedfordshire, Cambridgeshire and Hertfordshire (BCH) major crime unit, said: "We have made a number of arrests but as we pursue a number of lines of enquiry we are also appealing for any witnesses or anyone who has information about what happened to contact us.
"We are in the early stages of this investigation and extensive enquiries are being carried out to help establish the sequence of events before and after the incident."
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