The six-strong gang rode into Brent Cross shopping centre in north London on three motorcycles shortly after 10.15am yesterday.
In scenes reminiscent of the opening of James Bond's Skyfall, three pillion passengers got off and ran towards Fraser Hart jewellery store on the ground floor, smashing display windows and making off with a haul of watches and other items.
The trio fled to the awaiting motorbikes and sped off. The bikes were found abandoned 15 minutes later. No arrests were made.