A jewellery shop has been raided at a north London shopping centre, with sledge hammers and pick-axes recovered afterwards.
Five men have been arrested after the store in Brent Cross shopping centre was targeted at 02:30 BST. Scotland Yard said at least 12 suspects had smashed windows and stolen items from Goldsmiths Jewellers.
The area was searched by officers with the help of police dogs and a helicopter.
The group also attempted to steal items from Ernest Jones jewellers before escaping on foot and bicycles, police said.
Five men in their 20s and 30s have been arrested on suspicion of robbery. Some jewellery and watches were recovered, as well as the weapons, but the Metropolitan Police said they were still looking for the remaining suspects and property.