London ? Two well-dressed thieves walked into a London Bond Street jewelry store last week and, after brandishing handguns at shop workers, made off with 40 million pounds –$65 million — worth of gems in one of Britain’s biggest jewelry heists, police said Tuesday.

Security camera footage released by police shows two men in crisp suits entering Graff Diamonds’ flagship store Thursday afternoon. It was the third time a Graff store in London had been targeted in a high-profile raid in the past six years.

The men stole dozens of high-end rings, bracelets, necklaces and watches worth 40 million pounds, or $65 million, and fired two gunshots into the ground as they escaped in a series of getaway cars, police said. No one was hurt.

It was among the biggest heists in British history — far outstripping the 1963 Great Train Robbery in which 2 million pounds were lost.

Last week’s theft, however, was topped by the 2006 robbery of 53 million pounds in cash from a security company depot in southern England, and was rivaled by the 1987 theft of an estimated 40 million pounds from the Knightsbridge Safe Deposit Center in London.