[mvonfr]

and I don't think ETA has ever tried for such mass death.

The usual ETA pattern is to warn in advance about bombs so as to minimize the civilian casualties.

[Betaille]

"The usual ETA pattern is to warn in advance about bombs so as to minimize the civilian casualties."
Exactly. This does not look like ETA. I would bet money that this was Islamic terrorists

[laconic]

Its been documented that the ETA: 1) tried to bomb the Madrid train station at Christmas and were caught first; and, 2) ETA cowards were caught with 1,200 pounds of bombs when stopped in a routine traffic check by Madrid police. Perhaps this is just cover for the alQaeda scum, but it certainly looks like a pattern on ETA's part: Bombs/Madrid/Trains and just four days before the national elections.