TOLOSA, Spain, Oct 4, SPA -- A bomb exploded outside a court housein Spain's northern Basque region on Saturday, causingconsiderable damage but no injuries, AP quoted sources of regional police as saying. The detonation in the town of Tolosa was preceded by atelephone warning to a regional road rescue service by aman who said he spoke on behalf of Basque separatist groupETA. The caller said a bomb would explode by the court house at1:15 a.m. Saturday. Officers rushed to the scene where theyfound a rucksack and proceeded to cordon off the area, apolice statement said. The rucksack exploded at theannounced time and blew a large hole in the courthouse,breaking glass all around the building and damaging cars. As an organization, ETA normally doesn't claimresponsibility for its attacks until weeks after theyoccur.--SPA www.spa.gov.sa/595171