Energy infrastructure experts say fuel shipments should return to normal in Atlanta by this weekend. That’s after a ransomware attack shut down Alpharetta-based Colonial Pipeline’s vital fuel artery last week. University of North Georgia computer science professor Bryson Payne directs UNG’s Center for Cyber Operations Education. He told WABE’s “All Things Considered” producer Lily Oppenheimer that Colonial Pipeline was forced to pay its attackers a ransom — called a “double-extortion” attack. The FBI has said the hack was carried out by Darkside, a veteran criminal cyber group with roots in Russia and Eastern Europe. News broke this week that Colonial paid its attackers a ransom of $5 million almost immediately.