Three teenagers arrested over the fatal stabbing of a man at a 21st birthday party in Norfolk have been released on bail.
Connor Barrett, 20, from Great Yarmouth, died in hospital after the attack at The Glebe in Hemsby.
A 15-year-old boy arrested on Sunday and two other boys, aged 15 and 17, arrested in Great Yarmouth on Monday, are being held on suspicion of murder.
A police cordon remains around the scene of Saturday's stabbing.
Mr Barrett was stabbed at a property in The Glebe at 23:25 BST on Saturday.
He was a guest at the event when several people, believed to be would-be gatecrashers, attempted to go into the property and a scuffle broke out.
The mother and grandmother of the man whose birthday was being celebrated had both worked as nurses and tended to injuries to Mr Barrett's chest and back before an ambulance arrived.
'Touched many lives'
Lee Barrett, his father, said in a statement: "The tragic loss of my son Connor has left myself and the whole family utterly devastated and also a beautiful child fatherless.
"We have been comforted by the amount of wonderful tributes made by family members and friends of Connor.
"Connor was a loving, caring young man and a wonderful father who doted on his son.
"Knowing Connor was loved by so many and touched so many lives has made me extremely proud and grateful to have been a part of my son's short but full life."
Det Ch Insp Paul Durham said: "We have made progress with identifying and speaking to a number of people present at the party.
"We know that Connor died as the result of being stabbed by a knife or similar sharp-bladed instrument and we continue our searches to recover the weapon or weapons used."