The officer was attempting to detain two men who were trying to rob a grocery store in Westminster, police have said.
Greater Manchester Police received seven reports of robberies between 2am and 4am.
The elderly woman sustained multiple injuries to her head, knees and hands during the attack.
Or is it the world's subtlest homage to cinema's Charlie Chaplin/Keystone Cops era?
CCTV footage caught a robbery in which a Rolex was taken, according to Intelligence Bureau SA. The 'victim' remains oddly calm, though. You be the judge...