Experts investigating the cause of a train crash in Spain that killed 39 people have found a broken joint on the rails, a source has revealed.

A high-speed train derailment in southern Spain has left at least 39 people dead and injured more than 150, according to authorities.

The death toll is “not yet final”, said Spanish transport minister Óscar Puente, who has launched an investigation into the cause of the “extremely strange” incident. This is Spain’s worst train crash since 2013, when a high-speed derailment in Galicia, northwest Spain, left 80 people dead and 140 others injured.