Bomb Blast in Northern Spain
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.
The news agency did not say whether anyone claimed responsibility for the attack.
On Friday, the Basque separatist group ETA warned that its violent 40-year-fight for Basque independence "will continue" if the Spanish government doesn't offer "an adequate response to the root of the problem."
In the statement, ETA also claimed responsibility for four recent attacks, including the car bomb explosion at a Civil Guard barracks in northern Spain earlier in May that killed a Civil Guard member and wounded four others.