Police are hunting a man who indecently assaulted a 16-year-old girl as she walked home in Hull.
The attack happened as she took a short cut, close to Court Park Primary School, in the Orchard Park area, at 2030 GMT on Thursday.
Police say the man grabbed her from behind, threw her to the floor covered her face with his hand, and repeatedly assaulted her.
A Humberside Police spokesman described the attack as "particularly nasty."
He said the victim was distressed and shaken by her ordeal.
Her attacker is described as white, in his 30s or 40s, and had stubble. He was wearing a dark coat and white jeans.