The US government has announced a $3 million reward for information leading to the arrest of a man American authorities call one of the world’s most prolific cyber hackers. Evgeniy Bogachev, who is believed to be in Russia, was indicted in Pittsburgh last year on charges including bank fraud and conspiracy. His pictures have been plastered on “Wanted” signs distributed by the FBI. Bogachev is accused of acting as ringleader for a massive hacking operation that installed malicious software on victims’ computers to capture bank account numbers, passwords and other sensitive information. Despite the reward, arresting overseas hackers is difficult for US authorities, particularly in countries like Russia where there is no extradition treaty.