Police are appealing for witnesses after a man was robbed of his phone on April 2.
The incident happened at around 3.30pm when a 26-year-old man was sitting on a bench along Rosemary Lane, Lincoln.
He was approached by two men, one of which asked to use his phone, a touchscreen black Sony Ericsson. The other man then snatched it from him.
The offender ran off towards Monks Road, but the victim gave chase. He was tripped up and his trainer fell off. The offender took the shoe and hit him with it.
One offender is described as a white male aged 20-24, wearing a dark jacket and dark trousers. The other wore a white jacket and dark trousers.
Anyone with any information should contact Lincolnshire Police on 0300 111 0300 quoting incident 298 of 2nd April 2011.