A woman was hit with a roof slate, dragged on to a sports pitch and raped.
The victim was walking on Westend Street in Oldham when she was approached by a man who grabbed and hit her, Greater Manchester Police said.
The woman, believed to be in her 20s, went to a nearby house for help following the attack at about 04:40 BST and was taken to hospital.
The offender is described as a slim, white man, in his early 20s, with brown hair and a Manchester accent.
He was wearing dark clothing with a hood pulled over his head.
Det Insp Ian Harratt said: “It’s very distressing that a young woman has been attacked and raped in such a brutal way, we are doing everything we can to find the person responsible.”
If you enjoyed our content, we'd really appreciate some "love" with a share or two.
And ... Don't forget to have fun!