The truck carrying 17 police officers was passing the La Union residential complex near the center of the Nieva municipality when unidentified persons thew a bomb at the vehicle.
Minutes after the attack, police caught a woman trying onto flee the scene on a motorcycle who had dropped a grenade. Explosives experts safely detonated the grenade.
The injured were brought to General Hospital in Nieva and two have been discharged.
The Huila department sees a strong presence of members of Colombia’s largest guerrilla group FARC.