(17:45) Some fifty passengers are reported as slightly injured.
The accident has taken place near the city of Montpellier, rescuers said.
A tree has fallen over the rails used by a regional train linking Nîmes and Montpellier.
It was allegedly uprooted by severe hailstorm.
(17:35) A train has crashed in the south of France.
According to media reports, 10 passengers are said to be in critical condition.
More uldates to follow.
#BREAKING Train crashes in southern France, around 10 'severely injured': rescuers— AFP news agency (@AFP) August 17, 2016