The raid followed the arrests Wednesday of two suspected ETA members, including a man described as a senior figure in the organization, in southwest France, and two more arrests at a highway checkpoint near the Basque town of Ermua. ETA has claimed or been blamed for more than 800 deaths since the late 1960s. More than 200 suspected ETA members have been arrested in the past two years, including its longtime leader Mikel Antza, and the group has not staged a fatal attack since it killed two policemen with a car bombing in the northern Spanish town of Sanguesa in May 2003. Many in Spain say last year's Madrid train bombings by Islamic militants left ETA in a quandary. That attack killed 191 people and caused such a revulsion over terrorism that ETA is seen as wary of causing major bloodshed for fear of a political backlash that could drain support for Basque nationalism.