The suspected military chief of the armed Basque seperatist group ETA has been arrested in southern France.Garikoitz Aspiazu, also known as Cherokee, was detained in a town in the Hautes Pyrenees region, close to the Spanish border. The 35-year-old is suspected of masterminding the murders of two Spanish civil guard police in the French town of Capbreton in December 2007. ETA is accused of killing more than 800 people in its 40-year campaign for an independent Basque nation. The group resumed its campaign of violence in December 2006, after the collapse of secret dialogue with the Spanish government. Some reports say Aspiazu is suspected of ordering the car bombing of Madrid airport in 2006 which killed two people. The overnight arrest is the latest in a string of captures of high-profile ETA fugitives.