( dpa ) - Spanish police have arrested two activists of the armed Basque separatist group ETA who are believed to have carried out one of ETA's biggest attacks in recent years, Interior Minister Alfredo Perez Rubalcaba announced Wednesday.
Igor Portu and Martin Sarasola were captured Sunday on a road near Mondragon in the Basque region.
They have now been identified as those who staged a car bombing at a Madrid airport underground parking lot in December 2006, killing two Ecuadorian immigrants, Rubalcaba said.
Police were searching for a third suspect.
The arrests of Portu and Sarasola have sparked controversy over the injuries they sustained. Portu was hospitalized with a broken rib, a pneumothorax and bruises, while Sarasola's injuries were less serious.
Basque separatist parties and organizations accused police of torture, but police and Rubalcaba attributed the injuries to the suspects' attempts to resist arrest.
The arrests led police to two arms caches which contained a total of about 150 kilograms of explosive materials.
The car bombing at Madrid airport in December 2006 interrupted ETA's ceasefire and prompted Prime Minister Jose Luis Rodriguez Zapatero to call off a six-month attempt at peace talks with the group.
ETA then ended the ceasefire officially in June 2007, and has killed two police officers since then.