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UK-MTGOX-SUBPOENA:Mt. Gox receives subpoena from federal prosecutor - WSJ
Reuters A man walks past a building where Mt. Gox, a digital marketplace operator, is housed in Tokyo February 25, 2014. REUTERS/Toru Hanai

(Reuters) - Bitcoin exchange Mt. Gox has received a subpoena from federal prosecutors in New York, the Wall Street Journal reported, citing a person familiar with the matter.

Mt. Gox, once the world's biggest bitcoin exchange, abruptly stopped trading on Tuesday and its chief executive said the business was at "a turning point," sparking concerns about the future of the unregulated virtual currency.

The subpoena was sent this month and asked Mt. Gox to preserve certain documents among other things, the Journal said. (http://link.reuters.com/tep27v)

(Reporting by Chris Peters in Bangalore; Editing by Supriya Kurane)