Violence between armed groups in the Catatumbo region has displaced more than 32,000 people, rights groups estimate.
Thousands have escaped a sudden outbreak of drug-related violence between two armed groups in northeastern Colombia.
Government sends troops into coca-rich northeast Catatumbo region in bid to quell hostilities among rebel groups.
Attacks by rebel ELN fighters in the Catatumbo region have forced thousands of people to flee the area.