Coincheck, a major cryptocurrency trading exchange in Tokyo, has been hacked into and has lost about $534 million worth of virtual money, national broadcaster NHK reported on Friday.

Coincheck posted on its website on Friday afternoon that it had suspended withdrawals of almost all cryptocurrencies.

A man checks the graph showing recent fluctuations on Bitcoin exchange rates against the U.S. dollar on his laptop during a media opportunity at the Tokyo Bitcoin weekly meeting at a restaurant in Tokyo. /Reuters

The exchange has already reported the incident to the police and to Japan's Financial Services Agency, NHK said.

In 2014, Tokyo-based Mt. Gox, which once handled 80 percent of the world's bitcoin trades, filed for bankruptcy after losing some 850,000 bitcoins -- then worth around half a billion U.S. dollars -- and $28 million in cash from its bank accounts.

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