And other images show a caravan upended after a river in Saint-Julien-de-Peyrola overflowed its banks.
In southeastern France, 1,600 people were evacuated because of a "violent" storm, according to a government statement Thursday.
Rescuers continued to search for a missing German monitor at the campsite, which was inundated during the flash floods on Thursday that reportedly swept away his van.
The worst hit areas are Gard, Ardèche and Drôme, which are all popular holiday sites.
The men, who were not named, were the president and vice-president of a charitable foundation that brought had children from Leverkusen in Germany's industrial Rhineland region to the village of Saint-Julien-de-Peyrolas, said Eric Maurel, the public prosecutor for the region.
Trapped by a fast-flowing torrent, he sought shelter inside his caravan - but the vehicle was swept away, the AFP news agency reports. However, Mr. Dousset, the top aide of the Gard administration, said no one knew for certain yet that the man was in his van at the time.
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The Gard government said four German children were taken to hospital on Thursday suffering from hypothermia in Bagnols-sur-Cèze.
"No one has suitcases".
They were among 10 people treated for minor injuries. The mayor of Bagnols, Jean-Yves Chapelet, told BFM-TV many Dutch tourists were among the 350 campers evacuated there. About 17,000 homes in the southwest and northeast were without power.
It's been advised that locals give time for flood waters to recede, and keep an eye on local weather reports before they travel.
Numerous roads in the affected area remained cut off as night fell.