Colombia - At least six people have been killed and more than a dozen injured in an attack on a police station in western Colombia.

The violence in Villa Rica comes a day after 11 people were killed in an explosion in Tumaco, in the south.

Police blamed that attack on the left-wing rebel group, the Farc.

The rebels have been stepping up their offensive against the security forces since their leader was killed in a military operation in November.

Police officials said the commander of the police statio was among those killed when explosive devices went off outside the police station in Villa Rica, in Cauca province.