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.