At least 11 people were killed when a landslide hit southwest Colombia's department of Narino, the country's disaster relief agency (UNGRD) said on Tuesday, adding that dozens more were hurt or missing.

"Our volunteers are aiding the search for missing people," the agency said via Twitter, following the incident in a rural area of the municipality of Mallama.

Members of Civil Defense, the Red Cross, and the police and fire departments were participating in the rescue effort, using search dogs specialized in finding people trapped underground.