MTGox halted transfers of the digital currency to external addresses on 7 February.

　　The Tokyo-based firm said it had found a loophole that thieves could use to fool the transaction process into sending double the correct number of Bitcoins. 

　　The issue also left it vulnerable to attacks, which slowed down the rate at which coins could be bought and sold.

　　The loophole was also thought to have been exploited by thieves, who stole about $2.7m in Bitcoins from the Silk Road 2 website earlier this month.

　　However, last week, the exchange said that customers would be able to starts withdrawals "soon".

　　So far, MtGox has not issued any statement about reasons behind the site going offline and whether it would be back.

　　However, one report claimed that the exchange had become "insolvent" after losing 744,408 Bitcoins - worth about $350m (£210m) at Monday's trading prices.

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