And in a separate development, two ETA suspects were arrested on Wednesday night in Eruma, in the Basque Country. They were not named but security sources said they were aged 18 and 21.
Ministry sources said the arrests in France came as part of Operation Jail, a crackdown on ETA in south-western France and added they would give further details in a new conference on Thursday morning. Police moved in on Segurola as he parked his car.
On his arrest he was found to be in possession of a 9mm pistol, ammunition and false papers, while a 38mm firearm was found on Saldua, who likewise had ammunition and false documents on her. Police were investigating the contents of several plastic bags in the pair's vehicle which contained a substance believed to be explosives. The bags also contained false number plates and tools to break into vehicles, the statement said.
Earlier this month, ETA claimed responsibility for eight attacks in January and February, saying they were aimed at Spanish economic interests and politicians it claims are impeding a settlement to their separatist conflict. ETA is blamed for more than 800 deaths in a four-decade struggle for an independent Basque state covering parts of northern Spain and southwest France. The last fatal attack the group carried out was in May 2003.