A 72-year-old woman had her purse snatched at the junction of Philip Street and Ratcliffe Street, Darwen.
The incident happened about 10.30am on Sunday.
The thief made off in the direction of Philip Street with the small black leather purse containing £4 cash.
If you can help call 0845 1 25 35 45 or Crimestoppers anonymously on 0800 555 111.
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