A collision between two high-speed trains in Spain on Sunday has left 39 people dead. The disaster struck in the evening when a service travelling from Malaga to Madrid derailed, crossing onto the other track where an oncoming train crashed into it and also derailed.

The closures were announced after a high-speed train derailed and smashed into another high-speed train, killing at least 39 people and injuring dozens.

Spanish police said Monday that at least 39 people died in the a high-speed train collision Sunday in southern Spain and rescue efforts were continuing.

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.