A 19-year-old woman was sexually assaulted in King's Lynn.
It happened as she walked through Hillington Square at around 3am on Monday, May 4.
The teenager was approached from behind by an unknown man who pulled her to the floor and groped her chest before slapping her across the face.
She managed to struggle free and the man ran off. He was white, 5ft 10in tall, of slim build and wearing a blue hooded top, dark trousers and white trainers.
He is believed to have left the Kudos nightclub and walked through the town with another man before approaching the woman at the entrance to Hillington Square.
After the assault he walked along London Road towards the Southgates.
Anyone with information relating to the incident should call Det Con Emma Cross at Norfolk Constabulary on 101 or Crimestoppers anonymously on 0800 555 111.
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