(From L) Spain's Princess Letizia, Crown Prince Felipe, King Juan Carlos and Queen Sofia survey troops on parade during Armed forces day in Zaragoza on June 01,  2008. A bomb exploded in Spain's northern Basque region early Sunday, causing three minor injuries, following a warning call from the separatist group ETA, regional authorities said. Getty Images logo Getty Images 17 months ago

(From L) Spain's Princess Letizia, Crown Prince Felipe, King Juan Carlos and Queen Sofia survey troops on parade during Armed forces day in Zaragoza on June 01, 2008. A bomb exploded in Spain's northern Basque region early Sunday, causing three minor injuries, following a warning call from the separatist group ETA, regional authorities said.