Mark Karpeles, chief executive of Mt. Gox, bows at the start of a news conference at the Tokyo District Court in Tokyo, in this photo taken by Kyodo February 28, 2014. Mt. Gox, once the world's ... more 
Mark Karpeles, chief executive of Mt. Gox, bows at the start of a news conference at the Tokyo District Court in Tokyo, in this photo taken by Kyodo February 28, 2014. Mt. Gox, once the world's biggest bitcoin exchange, filed for bankruptcy protection on Friday, saying it may have lost all of its investors' virtual coins due to hacking into its faulty computer system. Karpeles, bowing in contrition and wearing a suit instead of his customary T-shirt, apologised in Japanese at a news conference for the company's collapse, blaming "a weakness in our system." Mandatory credit REUTERS/Kyodo (JAPAN - Tags: BUSINESS CRIME LAW TPX IMAGES OF THE DAY PROFILE) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN. YES less 
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Reuters | Photo By KYODO / REUTERS
Fri, Feb 28, 2014 7:01 AM EST