Cryptocurrency exchange Binance has said at least $3 bn in funds have been frozen following a “potential security issue”.

The world’s largest crypto exchange said on Thursday that it had suspended all deposits and withdrawals “as a precaution” as it investigated the situation and engaged law enforcement.

Binance said it was “working around the clock” to trace and freeze additional assets and would share a “full post-mortem” once its investigations were complete.

The company added that it would cover “all losses” and user funds were safe.

“Our security teams are reviewing all relevant information with urgency, and we will provide updates through official Binance channels as soon as we have verified information,” Binance said in a statement to Al Jazeera.

“Users should remain cautious of scams and should not trust unofficial links, messages, or requests for account information.”

The price of Bitcoin, the world’s most popular cryptocurrency, fell about 5 percent following the incident, dropping below $77,000.

Changpeng Zhao, Binance’s founder and largest shareholder, said the exchange appeared to have been targeted in a cyber heist.

“It does look like a hack on Binance,” Zhao, who no longer manages Binance’s operations after stepping down as CEO in 2023, said in a post on X.

“I don’t manage Binance (.com) anymore, but as a shareholder, I expect all user funds will be fully covered.”

If confirmed, the hacking would rank as the largest theft of crypto assets in history, exceeding the $1.5bn crypto heist carried out by the North Korean state-backed Lazarus Group in 2025.

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Cyber criminals stolen $2.87bn in crypto assets in nearly 150 hacking incidents in 2025, according to the 2026 Crypto Crime Report produced by market intelligence firm TRM.

Binance, founded in China by Zhao in 2017, has about $155 billion in assets under its management, more than any other exchange, according to CoinMarketCap.