A man was attacked and had his mobile phone stolen.
The victim, 22, was approached from behind by a man who grabbed his arm and held it behind his back.
He then stole his mobile phone from his trouser pocket.
The incident happened at the junction of Halifax Road and Newsome Street in Dewsbury between 10pm and 11pm on Wednesday.
And police are now appealing for witnesses.
The suspect is described as white, around 6ft tall and of medium build.
He was wearing a white long-sleeved hooded top, black trousers, black trainers and gloves.
Anyone with information is asked to call Kirklees CID on 101.