Officers from Scotland Yard’s flying squad have arrested a 50-year-old man in east London in connection with a £40 million (€46.6 million) jewellery robbery at a Mayfair shop.
The man, since released on bail pending further inquiries, was arrested outside a house in Ilford on Monday, police said.
Officers have also raided several properties in the British capital and are following up new lines of inquiry following the release of CCTV footage showing two men entering Graff jewellers in New Bond Street.
The two armed robbers, one white and one black and both dressed in smart suits, made off with 43 items of jewellery last Thursday in what is believed to be the biggest gems robbery in British history.
It is thought the thieves were helped by a series of getaway drivers.
A police spokesman said: “Following the release of CCTV images of two men they want to speak to, officers are currently following up a number of inquiries.”