A 16-year-old boy has been stabbed to death after an argument at a party, police have said.
Luke Howard was found injured by police who were called to a house on Ashcombe Road, Old Swan, Liverpool, at about 0700 BST on Saturday.
He was taken to hospital with stab wounds but later died.
Merseyside Police said a boy, 15, was arrested on suspicion of murder after handing himself in at a police station. He was being questioned by police.
Supt Graham Yip, of Merseyside Police, said: "It appears that this incident took place following an argument at a party at this property.
"We are appealing for anyone who was at the address during the course of this party to come forward and make contact with the police.
"House-to-house inquiries are ongoing and there is a high visibility police presence in the area."
A post-mortem examination is due to take place later.
Elsewhere on Merseyside, a 22-year-old man was in a critical condition in hospital after a separate stabbing.
Police were called just after 0700 BST to Snowberry Road in Dovecot after reports the man had been stabbed.
A 23-year-old man has been arrested on suspicion of attempted murder and was being questioned by detectives.
Police said there was no suggestion the incidents were linked and asked for anyone with information about either incident to contact the force or Crimestoppers.