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The FBI has accused North Korea of stealing more than $6 billion in virtual assets from the cryptocurrency exchange Binance in what is thought to be the biggest-ever crypto heist.

Its statement came as Binance offered reassurances it was covering the losses from the hacking attack, saying it has used company funds to buy tokens to replenish 90 percent of what was stolen.

News of the cyberattack caused the prices of most major cryptocurrencies to fall sharply on Oct. 30.

The FBI confirmed earlier suspicions from private investigators and analysts that a North Korea-affiliated group called TraderTraitor was behind the hack.

TraderTraitor is the same group blamed for a…