Seven children arrested following the death of a man who suffered a serious head injury have been released on police bail.
Warren Free, 42, was airlifted to hospital after he was found injured at an address in Spalding, Lincolnshire, on Thursday.
The victim, from Coronation Close, in Spalding, died the next day at Nottingham's Queen's Medical Centre and police are treating his death as murder.
Five boys and two girls who were arrested as part of the murder investigation have been bailed, Lincolnshire Police said. None of the children's ages have been released by police.
Detective Chief Inspector Martin Holvey said: "In the early hours of last Thursday morning, we know that there was an incident involving Mr Free and a group of youths, and that he sustained injuries which subsequently led to his death.
"At present, I cannot confirm the cause of death as further tests need to be carried out.
"Our investigation is continuing into the circumstances leading up to Mr Free's death.
"This is a very unusual incident for Lincolnshire as a county, and specifically for the Spalding area.
"I would like to thank the public in the town for the help they have given so far, but continue to appeal to anyone who knew Mr Free, and who has any information, no matter how insignificant it may seem, to contact the Incident Room".