3 Min Read NEW YORK (Reuters) -U.S. retail gasoline prices hit seven-year highs on Monday and many filling stations in the Southeast were still without fuel as the region slowly recovers from a cyberattack on the nation’s largest fuel pipeline. Slideshow ( 4 images ) Last week’s closure of Colonial Pipeline’s 5,500-mile (8,900-km) system was the most disruptive cyberattack on record, preventing millions of barrels of gasoline, diesel and jet fuel from flowing to the East Coast from the Gulf Coast. That alarmed drivers, who took to gas stations to fill tanks and jerry cans. Last week more than 15,000 gas stations were without fuel. Some stations have since been supplied, with Colonial once again operating. On Monday, 11,667 stations were without fuel, down from 12,466 stations the previous day, according to tracking firm GasBuddy.