Updated

Basque regional police say a bomb has exploded outside a court house in Tolosa in Spain's northern Basque country, causing considerable damage but no injuries.

Police say the detonation was preceded by a warning call made to a regional road rescue service by a man who said he spoke on behalf of the Basque separatist group ETA.

The caller said a bomb would explode by the court house at 1:15 a.m. Saturday local time. Officers rushed to the scene where they found a rucksack and cordoned off the area.

The rucksack exploded at the announced time and blew a hole in the courthouse, breaking glass all around the building, police say in a statement.

On Sept. 22 ETA killed Sgt. Major Luis Conde de la Cruz, 46, after placing a large car bomb in Santona.