Lt Col Mauricio Cardenas says the attack occurred about 5:15 am (1015GMT) today on a police station in the community of Inza, in Cauca department southeast of the capital of Bogota.
Cardenas says rebels of the Armed Revolutionary Forces of Colombia threw artisanal mortar at the police station from a truck, destroying that and several other buildings.
The Colombian Army says in a statement that five members of the military, two civilians and one police officer were killed. Another four military members and three police officers were wounded.