Mexico has opened an investigation into what caused a deadly pipeline explosion, including possible negligence by authorities, the attorney general said Monday, as the death toll rose to 91 people. It is still unclear exactly how events unfolded leading up to the Friday blast, which occurred as hundreds of people rushed to collect fuel in buckets and jerrycans from a geyser of gasoline that was spouting from an illegal pipeline tap near the town of Tlahuelilpan, in the central state of Hidalgo. Attorney General Alejandro Gertz said investigators were trying to determine who tapped the pipeline — whether locals acting alone or one of the criminal gangs that have turned fuel theft into a booming industry in Mexico.
