https://cdnph.upi.com/ph/st/th/6151776848419/2026/upi/c3876edbe17f722aa763d37b7b62aca9/v1.5/North-Korean-hackers-tied-to-290M-crypto-heist-firm-says.jpg" /> North Korean-linked hackers were likely behind the theft of hundreds of millions of dollars in cryptocurrency over the weekend, a blockchain technology firm said.