North Korean hackers have stolen $1.5 billion in cryptocurrency in a single heist, making it the largest crypto hack on record, security experts told CNN.

The FBI has accused North Korean-linked hackers of conducting one of the largest known thefts of cryptocurrency — worth some $1.5 billion — from a Dubai-based firm.

Bybit clients withdrew almost $4 billion within two days of the attack; the company recovered just 3% of the total of the stolen crypto assets