Over 30 people were injured after two trams collided in the French city of Strasbourg, local officials said. Firefighters at the scene estimate the number of the injured may be around 50. Fortunately, there seems to be no one with serious injuries. Local media reported that one of the trams reversed into and collided heavily with another one at an underground tram station. The reason of the collision is under investigation, but prosecutors have ruled out the possibility of a delibrate act.