An already bad year for cryptocurrencies took another turn for the worse after roughly $100 million of Binance Coin was stolen in what appears to be the latest hack to hit digital assets.

An exploit occurred on a bridge between blockchains and the issue is “contained now,” Changpeng “CZ” Zhao, billionaire co-founder of Binance, the world’s biggest crypto exchange, said on Twitter on Friday.

A spokesperson for Binance-backed blockchain BNB Chain estimated the incident involved $100 million to $110 million of digital tokens.

At least $7 million of stolen funds has already been frozen, the spokesperson added. The bridge, BSC Token Hub, has been suspended.

About $2 billion has been lost in crypto hacks this year, many perpetrated by North Korea-linked groups.

Cross-chain bridges used to transfer tokens across blockchains have been a popular target.

The Binance ecosystem is among the highest profile to be buffeted. Zhao said on Twitter that “in all likelihood, Binance will cover any fund that the hackers get away with.”