Detectives are hunting a gang of youths who robbed two teenagers in Dewsbury Market.
The 16-year-old boys needed hospital treatment after the assault.
Police said the two were approached by the group of youths, aged around 18 to 20, and dressed in dark clothing.
The boys were then knocked to the ground where the attack continued.
A gold-coloured Samsung Galaxy S6 phone, a Hublot brown leather wristwatch with circular face and cash were stolen in the attack.
The teenagers were treated in hospital for their injuries.
Anyone who witnessed the attack on Thursday, October 27 between 8.30pm and 9pm, or who has any information, is urged to contact Det Con Oliver Coates, of Kirklees CID, on 101 quoting crime reference number 13160544307.
In unrelated investigations, police would like to speak to the people pictured in the image gallery below. The people pictured in the images may be witnesses as well as suspects. If you recognise anyone, contact police on 101 quoting the reference number on the image caption.
