MADRID, Sept 21, 2008 (AFP) - Suspected Basque separatists threw petrol bombs at a police station in Ondorroa in northeast Spain to lure officers outside before detonating a car bomb, which injured 10 people, police said Sunday.

'They parked the vehicle next to a wall close to the police station, before getting out and throwing petrol bombs to try to entice officers outside,' a police spokesman told AFP.

The attack came only hours after a car bomb exploded in the regional capital of Vitoria. Nobody was injured. Authorities suspect the militant Basque separatist organisation ETA of having been behind both blasts, each involving around 100 kilos (220 pounds) of explosives.

Spanish Prime Minister Jose Luis Rodriguez Zapatero comdemned the attacks, vowing that 'democracy would not step back a millimetre' from its fight against ETA.

Mariano Rajoy, the leader of the opposition Popular Party, promised to bring about 'the definitive defeat' of the seperatist organisation.

The leader of the regional government and head of the Basque Nationalist Party Inigo Urkullu also denounced the bombings.

A statement from the Basque region's interior ministry said that the car bomb at Ondarroa, a fishing port not far from Bilbao, had slightly injured seven people: three policemen and four passers-by.

There had been no warning ahead of the 4:30 a.m. (0230 GMT) blast, which caused substantial damage, the statement added.

Before the earlier blast in Vitora, police had received a warning from an anonymous caller claiming to speak for ETA.

That car bomb went off around midnight in front of the headquarters of the Caja Vital savings bank, causing considerable damage but no injuries, the ministry said.

The president of Caja Vital, Gregorio Rojo, is the brother of the president of the Spanish Senate, Javier Rojo.

Both attacks were very likely to have been the work of ETA, said the ministry statement.

Designated a 'terrorist organisation' by the European Union, the group has been blamed for the killings of 823 people since starting its campaign of violence 40 years ago.

Since abandoning its 'permanent ceasefire' in June 2007 ETA has killed four people and carried out a series of bombings, mostly in the northeastern Basque region.

Explosives were found attached underneath a police car in Bilbao on Tuesday, but the bomb failed to detonate.

The attacks come days after a series of legal judgements against Basque separatists.

Judges sentenced members of an ETA-affiliated group to eight to 10 years in jail on Wednesday, while the Spanish Supreme Court ruled Tuesday and Thursday that two separatist groups were illegal.

The supreme court said Basque Nationalist Action (ANV) and the Communist Party of the Basque Homelands had links with the banned Batasuna party -- seen as the political wing of ETA.