French rail authorities said Tuesday they were investigating the cause of a rare tram collision in a Paris suburb which injured 12 people, one of them seriously. The collision took place late Monday in the Issy-les-Moulineaux suburb southwest of the capital just after 9:00 pm (2000 GMT).

"Two tram carriages collided with passengers on board," a spokesman for the RATP Paris rail operator said. "The one in front was stopped, and the other crashed into it from behind," causing the first tram to derail.

Copyright Agence France-Presse, 2019