Spanish police say they have foiled an attempted terrorist attack at a Madrid train station. Basque separatists were apparently planning to blow up a train - if successful, it would have caused chaos on one of the busiest travel days of the year. Two suspected members of armed Basque group ETA have been arrested. The train was travelling to the capital when it was stopped and evacuated around 100 kilometres from its departure station - San Sebastian in the north. A 25-kilogram-bomb was placed on the train, another was seized beforehand. ETA has killed more than 800 people in its decades old campaign for an independent Basque state. Four years ago Spanish police prevented another Christmas bomb attempt, when they stopped a van packed with a tonne of explosives heading for Madrid. **PHOTO CAPTION*** Spanish police have arrested two suspected members of the Basque militant group ETA who were planning a bomb attack on a train arriving in Madrid, Interior Minister Angel Acebes said. (AFP/File/Cristina Quicler)