Amateur video shows shoppers running for cover after a shot rings out
The armed raid in which an estimated £40m worth of jewellery was stolen from a London store was captured on video by a passing member of the public.
The film shows the robbers outside Graff jewellers in New Bond Street, shooting as they make their getaway with a female member of staff.
The two robbers armed with handguns got away with 43 jewels and watches.
Detectives believe at least two other people helped the raiders as they sped from the shop.
They made their getaway in a blue BMW which was abandoned in nearby Dover Street.
Police described the two robbers as "extremely dangerous"
Another shot was then fired before they got into a silver Mercedes and drove into Farm Street where it is believed some of the suspects got into another vehicle, possibly a black Ford Galaxy or Volkswagen Sharan.
Among the items stolen were a pair of white round diamond double-hoop earrings, a yellow diamond flower necklace, a platinum white Marquise diamond ring and a Chronograff men's watch.
The haul is thought to be the biggest ever netted in the UK, almost doubling the £23m worth of items stolen in a raid on the same shop in 2003.
Det Ch Insp Pam Mace from the Flying Squad described the raid as "well planned" and said the robbers are "extremely dangerous".
The first suspect is described as white, about 30 years old, slim and between 5ft 10ins and 6ft tall.
The other man is described as black, in his 30s, 6ft tall, more well-built and with very short hair.
CCTV pictures of them entering the shop were released by officers.
Det Ch Insp Mace said: "Someone knows who these men are, they would undoubtedly have spoken about it beforehand or boasted about it afterwards.
"I would urge anyone who recognises them, knows the whereabouts of the jewellery or has any other information to contact us."
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