A pair of hammer-wielding robbers tried to raid a posh pawnbrokers in London - only to be thwarted by a smokescreen.
Dramatic footage shows the thieves, who were both masked by their motorcycle helmets, enter Chelsea's Prestige Pawnbrokers - beloved by celebrities including Janet Jackson.
The robbers appear to have smashed a large window to enter the shop, only to be foiled by a thick plume of smoke and startled by a blaring alarm system.
A woman filming from a window above shouts 'they're robbing' as the two enter the store, only to stumble back out again as the smoke thickens.
They then jump on their motorcycle, which was parked just outside, and flee the scene seemingly empty handed.
