Officers are asking for help tracking down three men in Cambridge.
Police in the city have released images of the men they'd like to speak to in connection with a robbery.
The incident happened at the Grafton Centre on 31 May at about 6:30pm.
The victim, a man in his 20s, was approached by three others who took his mobile phone.
Anyone who recognises the men is asked to contact police at www.cambs.police.uk/report quoting 35/38943/24.