http://cfrterrorism.org/groups/eta.html
Does ETA have ties to al Qaeda?
No. ETA’s secular nationalist agenda has nothing to do with the Islamist fundamentalism of Osama bin Laden’s terrorist network, and there is no credible evidence of any systematic cooperation between ETA and al Qaeda, experts say. But Qaeda cells have been discovered in Spain. In November 2001, Spanish authorities arrested eight men suspected of being Qaeda operatives involved in the September 11 attacks. One of these men reportedly had past links with ETA’s unofficial political wing, Batasuna, which the Spanish Supreme Court banned in March 2003. In September 2003, Spanish judge Baltasar Garzon said the September 11 attacks were partially planned in Spain.
So they don't have ties to Al Qaeda but they arrested an Al Qaeda guy with an ETA past. Yeah, that makes sense.