MASKED raiders made off with watches worth tens of thousands of pounds from a Richmond jewellers on Saturday.
A gang of four thieves, all wearing motorbike helmets and leathers, smashed the windows of Ernest Jones, in George Street, with a claw hammer, at about 8.45am.
They grabbed several trays of Rolex watches before jumping onto two motorbikes and speeding off. The vehicles, one red and one white, were both found in Burlington Road, Chiswick, on Monday morning.
The break-in is the latest in a series of armed raids at jewellers in Richmond.
On June 8, the same store was targeted by two men armed with an axe and a hand gun. On that occasion, the men walked in at midday and began smashing cabinets before making off in a Mercedes with various goods.
There have also been a number of similar robberies at neighbouring jewellers Courlanders earlier this year. No arrests have yet been arrested in connection with any of the incidents.
A police spokeswoman said Saturday's break-in happened in a matter of seconds, with the gang riding up an alleyway beside the department store Dickens & Jones next door as staff opened up. The sex of the gang is unknown.
A police spokeswoman said it is believed the same gang may be behind the raids, which follow the same style.
She added that there have been a number of similar insidents at Ernest Jones stores across London and the south east in recent weeks, including one in Guildford.
Anyone with information is asked to call DI Kris Latham at the serious acquisitive crime squad in Twickenham on 020 8247 7032, or Crimestoppers, free and anonymously, on 0800 555 111.