San Sebastian, Spain - Spanish police detained around 10 Basque separatists early Friday on charges of attacking rail installations and electricity substations, police said.

The suspected supporters of the militant Basque separatist group ETA were held in Guipuzcoa province. Police searched several addresses, including a separatist bar in Errenteria.

ETA bombed an office of Prime Minister Jose Luis Rodriguez Zapatero's Socialist Party in Bilbao on Thursday, causing slight injuries to seven police officers.

ETA has killed three people since ending a ceasefire in June 2007 after a negotiation attempt with the government collapsed. The most recent victim, former Socialist councillor Isaias Carrasco, was shot dead two days before the March 9 elections.

Zapatero's priorities for the upcoming legislature include the fight against ETA, which has killed more than 800 people in its four-decade campaign for an independent Basque Country. (dpa)