Tia Rigg was found by officers in the house at Dalmain Close
A 12-year-old girl found dead at a house in Manchester had been strangled and stabbed, police have said.
Tia Rigg was discovered by officers in a property at Dalmain Close, in the Cheetham Hill area, on Saturday with "multiple, significant injuries".
A 37-year-old man was arrested at the scene and is being questioned by officers.
Police said they were not looking for anyone else but have appealed for any witnesses to come forward.
Officers were called to the scene at 1545 BST on Saturday.
A post-mortem examination on Sunday found Tia had died as a result of strangulation and abdominal injuries.
Manchester stabbing girl named
Det Supt Mary Doyle said: "Tia was a happy, normal, healthy 12-year-old girl, she had friends, socialised normally. She was in the flush of youth, it's just an absolute tragedy.
"All murders are terrible but when it's a 12-year-old girl it's just horrendous."
The victim has three younger brothers and sisters.
Ms Doyle added: "The family are devastated, the world's falling apart for them. They are supporting each other as best they can.
"It is very, very raw for them and it's going to take a long time for them to get over it. We have officers supporting them."
Greater Manchester Police have not said whether the arrested man is related to Tia.