Are Muslims behind this? Santiago de Compostela is a famous pilgrimage destination for Christians (see earlier posts)
The Voz de Galicia newspaper (Spanish) and other media report more than 80 people were killed.
Deia.com said that double this were injured.
The train was heading between Madrid and Ferrol, according to the Europa Press (Spanish). At least four carriages had overturned, officials said. Deia.com reported that as many as 13 people were trapped inside the cars. Locals told Europa they heard an explosion at around 8:40 p.m. local time.