/europe
(CNN) -- Authorities have blamed the Basque separatist group ETA for a car bomb that exploded Friday outside a police station in northern Spain, CNN sister network CNN+ has reported.
The latest attack was similar to one carried out at the Basque Socialist Party offices on February 29.
The bomb went off at 1:20 p.m. local time (12.20 pm GMT) in Calahorra, in La Rioja, an autonomous community in the northern part of the country.
There were no reports of injuries. Spanish highway police received a warning call from ETA before the blast, allowing police to evacuate the area before it went off.
Police also took the precaution of suspending all Easter celebrations in the town after receiving the call.
It was unclear the extent of the damage the car bomb caused.
ETA is blamed for more than 800 deaths in its long fight for Basque independence. The United States and European Union list ETA as a terrorist group.
An ETA bomb at Madrid's airport in December 2006 ended a self-declared cease-fire and a fledgling peace process between the group and the government.
On February 29 this year, a bomb went off at the Basque Socialist party offices in Derio, northern Spain, after an ETA representative made a similar warning call an hour before the blast.
The group also attacked again on March 7, two days before national elections, when a man shot and killed a former town councilman in northern Spain. E-mail to a friend 
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