Mr Aznar particularly wants people who live in the Basque country but are not Basque nationalists to vote next month.

ECONOMIST: Spain and the Basques

But Javier Rojo, leader of the Socialist Party in the Basque Country, blamed ETA for Monday's blast and called it "a horrendous terrorist attack, " Reuters said.

CNN: Mystery Spain blast kills woman

But the fly-half, who missed five kicks at goal in the Basque country, saw his effort fall short as Biarritz surged into the semi-finals for the first time since 2006.

BBC: Ospreys 'robbed' in Biarritz loss - Adrian Hadley