MADRID , Spain ( CNN ) -- A powerful car bomb exploded outside a regional television station in Spain 's Basque region Wednesday after police got a warning call from the separatist group ETA , authorities said . Spanish Prime Minister Jose Luis Rodriguez Zapatero says ETA is losing all the battles . The blast occurred in the city of Bilbao around 11 a.m. ( 5 a.m . ET ) . The warning came an hour ahead of the bombing and gave police enough time to evacuate the area , including some 500 people working at the government-run Basque regional TV , known by its initials EiTB , and in other nearby offices . There were no immediate reports of casualties , but the blast shattered the glass facade of the TV station 's new headquarters . It was the first major attack blamed on ETA since police arrested two of its suspected top leaders recently . ETA is blamed for more than 800 deaths in its long fight for Basque independence and is listed as a terrorist group by the European Union and the United States . Last month during an anti-terrorism raid in France , authorities captured the man then considered to be the overall chief of the Basque separatist group . Authorities said the suspect , Mikel Garikoitz Aspiazu , 35 , alias `` Txeroki , '' was in charge of both ETA 's military and political , or policymaking , wings . Just three weeks later , on December 8 , police arrested Txeroki 's alleged replacement , Aitzol Iriondo Yarza , 30 , the new suspected head of the ETA commandos . He was also arrested in France , ETA 's traditional rear guard base just across the border from Spain . Watch the explosion » . After that , Spanish Prime Minister Jose Luis Rodriguez Zapatero said ETA was more `` isolated '' than ever and he ruled out fresh talks with them . `` The end of ETA can be seen only with the push from the rule of law , '' Zapatero said in an interview on December 18 with CNN affiliate Cuatro TV . He said police had arrested 365 ETA suspects in the past two years , notably the two recent suspected top ETA leaders and their alleged ETA chief predecessor , who was detained last May , also in France . On Wednesday after the Bilbao blast , Zapatero told an audience in southern Spain that `` ETA can attack but it is going to lose all the battles . '' Top Spanish officials have repeatedly warned that ETA is not yet finished . An ETA communique during the autumn threatened many targets , including government-run media outlets . The previous major car bomb blamed on ETA was on October 30 at the University of Navarra in Pamplona , which injured 27 people and caused extensive damage . The Bilbao bomb comes two years after ETA 's car bomb at Madrid 's airport that killed two men and destroyed a parking garage . There are about 600 ETA convicts or suspects in Spanish jails and 150 others in French jails , authorities in the two countries have told CNN .
Bomb exploded outside a television station in Spain 's Basque Country . Police got a warning call from the separatist group ETA . The warning came an hour ahead of the attack ; police evacuated area .