The suspected head of armed Basque separatist group Eta has been arrested in northwest France, reports say. Alejandro Zobaran Arriola was among four Eta suspects held in an operation by French police near the Belgian border, Spanish national radio reports. Mr Arriola was described as the group's "new military chief". Eta's campaign for independence for the Basque region has cost more than 800 lives since 1968 but it called a halt to armed attacks last year.