Spanish Prime Minister Pedro Sanchez declared three days of national mourning after a collision between two trains in Toledo province killed at least 68 people, European media reported on Wednesday. Transport Minister Oscar Fuente said the collision was caused by a malfunction in the train's signaling system. The system gave a signal to stop the trains, but after a while one of the trains accidentally received a signal to resume traffic. Photo: AR/TASS/Getty Images.

Spanish Prime Minister Pedro Sanchez declared three days of national mourning after a collision between two trains in Toledo province killed at least 68 people, European media reported on Wednesday. Transport Minister Oscar Fuente said the collision was caused by a malfunction in the train's signaling system. The system gave a signal to stop the trains, but after a while one of the trains accidentally received a signal to resume traffic. Photo: AR/TASS/Getty Images.