A would-be robber was scared off by the sound of a siren after he attempted to rob a woman of her handbag in Northampton town centre.
The 51-year-old-woman was approaching the Elm Street junction on Bailiff Street when she was approached by a man who punched her and tried to grab her bag.
At this point a siren was heard in the area, which startled the offender, who ran off empty-handed in the direction of The Mounts.
The attempted robbery happened on Wednesday, March 26, just after 1.30pm.
The offender is described as black, 6ft 3in with a stocky build, wearing a dark hoody with light-coloured jogging bottoms and trainers.
Witnesses, or anyone with information, can contact Northamptonshire Police on 101. Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.