Spanish authorities blamed the armed group ETA for small devices that exploded outside four courts in the Basque and Navarra regions early Tuesday, causing little damage and no injuries.
An Interior police spokesman said a warning call on behalf of ETA was made to the pro-Basque independence daily Gara announcing the last of the four blasts, which occurred in the small town of Guernika shortly after 8 a.m. (0600GMT).
Earlier Tuesday, Gara published a statement from the group in which it claimed responsibility for the blasts in recent months, while reiterating its willingness to hold talks to resolve the Basque conflict.
The other three blasts Tuesday occurred in the small towns of Ordizia and Amurrio, in the Basque region, and Berriozar, in the neighboring region of Navarra.
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