The operator of the Paris metro system on Wednesday apologised after hundreds of passengers on different trains were blocked underground in stifling temperatures at the height of the rush hour.
The RATP operator’s chief executive Jean Castex, a former French prime minister, has asked for an internal investigation to determine the causes of the “exceptional incident”, it said.
It said that five trains on the busy line 4 were stuck from 1725 GMT and had to wait underground between stations.
