A 12-year-old girl found murdered was strangled with a ligature and stabbed in the stomach.
Tia Rigg died from strangulation and multiple stab injuries to her abdomen, post-mortem examination results revealed.
The girl was found dead at Dalmain Close, Cheetham Hill in Manchester after a 999 call around 3.45pm on Saturday.
A 37-year-old man was arrested at the scene on suspicion of murder. Police have not commented on reports the suspect is her uncle. He is still in custody being questioned by detectives. No one else is being sought in relation to the murder inquiry, according to Greater Manchester Police (GMP).
A spokeswoman for GMP said: "A post-mortem examination has concluded that Tia Rigg died as a result of ligature strangulation and abdominal injuries."
Detective Superintendent Mary Doyle, who is leading the murder investigation, said: "She has suffered significant injuries and the suspect was arrested. There is evidence of some stab injuries and strangulation. 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 an 12-year-old girl it's just horrendous."
Tia's parents are understood to be separated and the victim had 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."
Ms Doyle would not be drawn on the suspect's relation to Tia, the murder weapon used or who first raised the alarm.
Young friends of the girl paid tribute to her on her Facebook page and a group with more than 650 members has also been set up on the social networking site, titled "R.I.P tia rigg" with two pages of messages from schoolmates and other friends.