May-be ETA hire outside help. In some Mafic hit in America the local mob hire hitman from than other city control by the Mafic to kill than witness or another mob member to avoid certain problem, like the local police know what very local mafic hitman look like.

1) ETA would have nothing to win with that. They learned it when they killed more than 20 people in Barcelona 17 years ago.
2) Al-Queda would have a lot to lose making an agreement with ETA because the spanish government has spies inside the band and it would have been an unnecessary risk: no terrorist group in the world can tell ETA his plans because there is a chance that the spanish intelligence service may receive them.
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