According to TRM Labs, which tracks the industry, digital assets worth more than $6.3bn (£4.7bn) have been taken from Binance by North Korean hackers. This would be the largest cryptocurrency hack to date - and one of the biggest in financial history.
The security exploit targeted Binance, one of the world's biggest platforms for trading digital assets, which said it was establishing the facts with urgency.
Deposits and withdrawals were suspended for customers - with the company insisting user funds were safe and all hacking losses would be covered.
According to TRM Labs an elite North Korean hacking unit called TraderTraitor was responsible for the theft - and it was completed in just 20 minutes.
That would make it the largest cryptocurrency hack to date - surpassing the $1.5bn that was stolen when the Bybit exchange was targeted last year.
Richard Teng, the co-CEO of Binance, said the company's "initial investigation suggests this security incident may have started with a compromised DevOps engineer's laptop".
"To be clear: the attacker did not simply use one engineer's permissions, and this was not a single 'one-click' action. It involved a more complex attack process," he said.
"Our investigation has not attributed responsibility to any individual. Our team hasn't stopped. We're working closely with law enforcement to ensure the matter is handled appropriately."
After Binance's security issue was identified, digital assets worth more than $3bn (£2.2bn) were frozen, which could prevent the funds from being cashed out by malicious actors.
But Mr Redbord said the attacker still controlled about $2.4bn (£1.8bn) worth of Bitcoin and Ether - the two biggest cryptocurrencies by valuation.
The company claims it has more than 335 million users around the world.
Bitcoin, the world's biggest cryptocurrency, dropped sharply in response to the news.
As of 1am UK time on Friday, it was trading at about $77,000 (£57,500) - falling by 5% over the past 24 hours. Some smaller digital assets saw their values plummet by closer to 10%.
The security exploit targeted Binance, one of the world's biggest platforms for trading digital assets, which said it was establishing the facts with urgency.
Deposits and withdrawals were suspended for customers - with the company insisting user funds were safe and all hacking losses would be covered.
According to TRM Labs an elite North Korean hacking unit called TraderTraitor was responsible for the theft - and it was completed in just 20 minutes.
That would make it the largest cryptocurrency hack to date - surpassing the $1.5bn that was stolen when the Bybit exchange was targeted last year.
Richard Teng, the co-CEO of Binance, said the company's "initial investigation suggests this security incident may have started with a compromised DevOps engineer's laptop".
"To be clear: the attacker did not simply use one engineer's permissions, and this was not a single 'one-click' action. It involved a more complex attack process," he said.
"Our investigation has not attributed responsibility to any individual. Our team hasn't stopped. We're working closely with law enforcement to ensure the matter is handled appropriately."
After Binance's security issue was identified, digital assets worth more than $3bn (£2.2bn) were frozen, which could prevent the funds from being cashed out by malicious actors.
But Mr Redbord said the attacker still controlled about $2.4bn (£1.8bn) worth of Bitcoin and Ether - the two biggest cryptocurrencies by valuation.
The company claims it has more than 335 million users around the world.
Bitcoin, the world's biggest cryptocurrency, dropped sharply in response to the news.
As of 1am UK time on Friday, it was trading at about $77,000 (£57,500) - falling by 5% over the past 24 hours. Some smaller digital assets saw their values plummet by closer to 10%.