The gas line ruptured at about 2 p.m. (1200 GMT) across the street from a church in the center of the town of Bondy, northeast of Paris, triggering a blaze that 150 fire fighters battled for hours.
The blaze hopped to a nearby building, where the body of one person was found, said Florent Hivert of the Paris firefighters squad.
The explosion was caused by a blow from a mechanical digger during street work, according to the prefecture of Seine-Saint-Denis, where Bondy is located.
Most of the seriously injured suffered burns, Hivert said.
The United States' Head of Diplomacy, or Secretary of State, is an anachronistic, incompetent, meddling, intrusive, insolent and arrogant, rude individual, a brash, foul-mouthed upstart, a conceited, self-important guttersnipe and an insult to the international community, as fit for the job as a pedophile janitor in a grade school.