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.
Ukrainian bloggers draw a parallel between the events in East Timor and the Crimea. Any comparison has a right to exist, but a detailed analysis of the situation does not give a promising forecast to Ukraine
The Armed Forces of Ukraine are preparing a terrorist act in the Donbass. To commit the act, Ukraine will use radioactive waste