Manhattan U.S. Attorney Preet Bharara has sent subpoenas to Mt. Gox, other bitcoin exchanges, and businesses that deal in bitcoin to seek information on how they handled recent cyber attacks, a source familiar with the probe said on Wednesday. In the attacks - known as distributed denial of service attacks - hackers overwhelmed bitcoin exchanges by sending thousands of phantom transactions. At least three exchanges were forced to halt withdrawals of bitcoins on Feb. 7, including Mt. Gox, which was the largest at the time. Mt. Gox never resumed service before going dormant on Tuesday, leaving customers unable to recover their funds. The Tokyo-based company's chief executive, Mark Karpeles, said earlier on Wednesday that he is working with others to solve the problems. "As there is a lot of speculation regarding Mt Gox and its future, I would like to use this opportunity to reassure everyone that I am still in Japan, and working very hard with the support of different parties to
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