A bomb exploded in the northern port city of Zarautz in Spain's Basque region Sunday, slightly wounding three people. Two police officers suffered minor ear damage and another person was hurt by shattered glass in the explosion, Spain's EFE news agency said. Shortly before the blast, someone called transportation officials and said a bomb would go off near a construction company, EFE said. Police cordoned off the area and asked residents to remain in their homes. Damage to the construction company building was not significant, EFE said.