The girl was attacked in broad daylight on Saturday and dragged under the supports of a footbridge. There, the man ripped off her clothes and hit her head against the ground several times, according to police.
The crime, which according to officers took place between 10am and 11.30am, is being classed as attempted rape. During the night the police received a number of tip-offs but on Sunday morning there were still no leads in the hunt for the attacker, said Marit Jöhnemark, a spokesman for Sörmland police.
“He tried to rip off her clothes and assaulted her. He smashed her head on the ground a number of times. Her face is in a bad way,” she said.
The girl was in a serious condition when she was discovered by a passer-by. She was taken by ambulance to Mälar hospital and has described her attacker as tall, in his 30s and wearing black and white clothes.
Police said they were very concerned about the fact that the attack took place outside, in broad daylight and in the middle of a city.
“We are naturally very keen to get in touch with everyone who could have seen or heard anything in connection with this,” said Jöhnemark.
The girl will be interviewed by police on Sunday.