Police in South Korea investigating the hack of a cryptocurrency exchange are eyeing a hacking group tied to the government of North Korea as the likely culprits, the Wall Street Journal reports.

On Tuesday, South Korean company Yapian, which operates the Seoul-based Youbit cryptocurrency exchange, suspended the use of all cryptocurrency and cash withdrawals and announced that it was declaring bankruptcy. Yapian reported that it lost 17 percent of its assets after a hacker on Tuesday stole the entire contents of its hot wallet. “The other coins were kept in the cold wallet and there were no additional losses,” the company says in a statement.

The company has not specified the type of cryptocurrency stolen or the value of the lost assets. But Yapian says that it holds a cyber insurance policy worth $2.8 million.

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