Boston Police Commissioner Ed Davis said the brothers -- armed with handguns and explosives -- apparently were planning another attack before the shootout disrupted their efforts.
The suspect is wanted in Spain to face allegations of membership of a terrorist organisation (Eta), an attack in conjunction with attempted murder, possession of guns and possession of explosives.
Most of the victims of the other attack were Iraqi civilians who happened to be in the area of eastern Baghdad when the car laden withexplosives went off.