Two thieves posing as customers have carried out what is believed to have been a multi-million diamond robbery at a leading jewellery store in London.
The thieves entered Graff Diamonds on Sloane Street, west London, and threatened the staff with guns.
The pair made off with a "substantial" haul, including some "significant" pieces of jewellery, police said.
Both men wore suits and were described as about 6ft tall and aged between 40 and 55 years - one wore a Panama hat.
The company, which is based at Bond Street, has branches in New York, Dubai and Moscow among other cities in the world.
It specialises in producing polished gems from rough stones and showcases some of "the most fabulous jewels in the world."
The thieves made away with rings, necklaces, pendants and earrings studded with gems, mostly diamonds, in the robbery, which happened at about 1710 BST on Thursday
Detective Sergeant Sarah Staff, of the Flying Squad, said: "Given the nature of the jeweller's targeted by these men, the items taken are significant and unique in design.
"Those caught up in the robbery have been left extremely shaken and we are speaking to them to gain as much information as possible."
Police are currently examining the CCTV footage from the shop and questioning customers and staff who were present at the time.