Binance said it had resumed withdrawals after more than $6 billion in virtual assets were stolen from the cryptocurrency exchange in a major hack the FBI said North Korea was responsible for.

The US law enforcement agency’s 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% of what was stolen.

Binance is the world’s largest crypto exchange by daily trading volumes. News of the cyberattack caused the prices of most major cryptocurrencies to fall sharply on Friday.

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