Four people have been arrested in northern Spain in a police operation targeting a suspected support group for the armed Basque separatists ETA. Two men and two women were detained in raids in and around San Sebastian. Greater co-operation between Spanish and French authorities has seen a major crackdown recently, with a string of high-profile arrests. ETA’s alleged military commander known as “Cherokee” was seized by police in November. His suspected replacement, dubbed “Gurbitz”, was subsequently taken into custody. Both arrests were made in France as was that of ETA’s suspected political leader Javier Lopez Pena alias “Thierry.” Madrid says the group has now been reduced to a relatively small number of fighters. But the killing goes on. Earlier this month, a 71-year-old businessman was shot dead in the Basque town of Azpeitia. The Spanish government blamed the attack on ETA.