The two buildings, one vacant and the other housing apartments, collapsed on Monday morning.
French rescue crews who labored through the night say they've found the body of a man in the ruins of two buildings that collapsed in a pile of beams and rubble in the southern city of Marseille.
Interior Minister Christophe Castaner, who arrived at the site Tuesday, said "air pockets" under the debris meant there's "hope to locate and find someone that can be saved". The building had been the subject of an appraisal and work in October.
A third adjoining building partially collapsed on Monday night.
In Marseille under the rubble of destroyed houses found the body of a second victim who was a woman.
The search has proven hard because one of the collapsed buildings, 63 Rue d'Aubagne, was closed and was possibly used by squatters.
Residents said Tuesday the structural risks of the buildings and others like them were widely known, but that city officials did little when alerted about them.
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Residents accompanied by police and firefighters recover their belongings from the collapsed buildings.
Previously, the government said that under the debris may be from five to eight people.
Only one of the buildings was occupied, as the two others were in such a bad state that they had been condemned.
Images taken before the collapse show large cracks in the facade of number 63; a former resident, retired college lecturer Mark Mason, told the Guardian he had been forced to sell his flat in the building to the council in 2012 under a compulsory purchase order after the first storey floor collapsed and chunks of masonry began falling from the building.
"The most important is saving lives", Castaner added from the scene.
According 2015, about 100 thousand inhabitants of Marseille, live in housing that threatens their health or safety.