(Bloomberg) -- A hacker group has stolen as much as $1 billion from banks and other financial companies worldwide since 2013 in an “unprecedented cyber-robbery,” according to computer security firm Kaspersky Lab.

The gang targeted as many as 100 banks, e-payment systems and other financial institutions in 30 countries including the U.S, China and European nations, stealing as much as $10 million in each raid, Kaspersky Lab, Russia’s largest maker of antivirus software, said in a report. The Carbanak gang members came from Russia, China, Ukraine and other parts of Europe, and they are still active, it said.

“These bank heists were surprising because it made no difference to the criminals what software the banks were using,” said Sergey Golovanov, principal security researcher at Kaspersky Lab’s global research and analysis team. “It was a very slick and professional cyber-robbery.”

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