The death toll has hit 20 in a politically motivated attack on a Colombian highway, as law enforcement has identified and is searching for a suspect.

At least 26 such incidents have taken place in the last two days, amid a wave of violence linked to drug-trafficking.

The civilian casualty toll in a recent wave of attacks blamed on Colombian narco-terrorists has risen to 20 dead and 36 injured, officials say.

Officials say a rebel leader known as "Marlon" ordered the attack in which 20 people were killed.

The death toll has hit 20 in a politically motivated attack on a Colombian highway, as law enforcement has identified and is searching for a suspect.