Police are hunting a knife-wielding "little old lady" who tried to rob a post office.

The woman threatened the cashier and demanded money.

But the bandit - aged between 65 and 70 - shuffled away empty handed when staff activated alarms.

The pensioner - who struck in Northenden, Manchester - is described as white, and about 5ft 2in.

She was of medium build with dark hair and was wearing a purple jacket.

Police are appealing to anyone who may have witnessed the robbery attempt, which happened at 11am on Thursday, to get in touch.