[Prodigal Son]

I've heard another explanation that might have something to it. Spain has rounded up an awful lot of ETA members in the past couple of years. Several hundred. It could be that as these members were replaced by younger, perhaps more impatient/radical members seeking to make their mark and push the process in a bold new direction, they wanted to do something more drastic.

Take it FWIW.

[mountaineer]

In a story posted about two hours ago, CNN is advancing the ETA-is-responsible theory, with no mention of Al Qaeda.