Four boys aged between 12 and 14 have been arrested on suspicion of rape.
The suspects, who are aged 12, 13, and two 14-year-olds, are in police custody arrested on suspicion of the offence in a car park of Morrisons in Rochdale.
Their arrests came after officers were called at about 6pm on Saturday to reports of a rape on Kingsway, in Newbold, Greater Manchester Police said.
A police forensic tent was erected in the car park and there is an increased police presence in the area.
The victim is currently being supported by specialist officers and a crime scene remains in place as officers continue their investigation.
The incident has left people who lived near the supermarket in shock, reports Manchester Evening News.
Lynn Davies, who lives by the cordon, told the newspaper: “I knew something had happened.
“The police came last night knocking on to ask if we had seen anything. It makes my skin crawl.
“It’s bad enough when it’s an adult, but children?”
John Hogkinson, 80, who also lives directly next to the crime scene, said: “The police came but we didn’t hear anything. We were shocked because it’s so quiet around here.”
He added it was “awful”.
A spokesman for Greater Manchester Police told Manchester Evening News: “At around 6pm on Saturday, February 10, officers were called to reports of a rape in Newbold, Rochdale.
“Four boys aged 12, 13, 14 and 14 have been arrested on suspicion of rape and remain in police custody.
“The victim is currently being supported by specialist officers.
“A scene remains in place as officers continue their investigation.”
A spokesman for Morrisons declined to comment when approached by the Manchester Evening News.
Express.co.uk has approached Greater Manchester Police for comment.
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