Men who sexually attacked girl, 14, 'being protected'
Detectives investigating a sexual assault on a 14-year-old girl in Milton Keynes said they believe the offenders are being protected.
The victim was targeted as she walked from a park in Great Holm on 25 April.
Three men held her down while a fourth seriously sexually assaulted her, Thames Valley Police said.
Det Con Wendy Fellowes said: "We are sure there are people who know who the offenders are, but... they are protecting the people responsible."
She added: "Despite extensive coverage in the media and a personal appeal from the victim's father we have received very little information from the public about this attack.
"We have forensic evidence so people don't need to be worried about naming the wrong person; we have evidence there to eliminate them if they are innocent.
"This was a vile, cowardly assault on a young girl and I would urge anyone who knows anything about this to contact me.
"People need to think how they would feel of this happened to their sister or daughter."
The main offender is described as mixed race, in his early 20s, at least 6ft (1.8m) with short black hair.
He had a distinctive beard from his jaw line down his neck but no hair on his face. He was wearing a black baseball cap, dark tracksuit bottoms and a light blue jumper.
One of the other three men is also mixed race and in his late teens to early 20s. He is described as being 5ft 8in (1.72m) tall and skinny.
He was wearing a baseball cap, white T-shirt, black tracksuit bottoms with a white stripe down the side and black chunky trainers.
The other two men are both white, in their early 20s, about 5ft 8in (1.72m) tall and also skinny.
One was wearing a black baseball cap, black or dark grey tracksuit bottoms and a blue T-shirt.
The second offender was wearing a denim-type hat with a short peak, dark blue jumper with red marks and navy blue tracksuit bottoms.