Peoria, IL, USA 1470 & 100.3 WMBD May 12, 2021 | 5:44 AM FILE PHOTO: Holding tanks are seen in an aerial photograph at Colonial Pipeline's Dorsey Junction Station in Woodbine, Maryland, U.S. May 10, 2021. REUTERS/Drone Base WASHINGTON (Reuters) – The shutdown of the biggest U.S. fuel pipeline by a ransomware attack highlights a systemic vulnerability: Pipeline operators have no requirement to implement cyber defenses. The U.S. government has had robust, compulsory cybersecurity protocols for most of the power grid for about 10 years to prevent debilitating hacks by criminals or state actors. But the country’s 2.7 million miles (4.3 million km) of oil, natural gas and hazardous liquid pipelines have only voluntary measures, which leaves security up to the individual operators, experts said.