The 67-year-old woman has been attacked a teenager in Strabane.
Shehad just left her home in the Melmount Road area of the town on Saturday evening when she was attacked by the boy.
Polie say he punched the woman in the face and as she fell, tried to grab her bag which was attached to a wheeled walking aid.
The tenager made off empty-handed when a number of witnesses stopped to help.
The woman was treated in hospital for shock and a facial injury.
Her attacker is described as 13 to 14-years-old, tall and wearing a black top.