Landslides triggered by days of heavy rain has killed 290 people in Colombia, according to the National Institute of Forensic Medicine and Forensic Sciences.
The Red Cross has also reported another 332 are injured were reported injured by the mudslides in the southwest Putumayo province.
Santos declared a state of emergency on Saturday for the city of Mocoa. Seventeen neighborhoods were hit, according to Colombian Red Cross chief César Urueña.
Santos stated on Sunday that the Air Force had transported some injured citizens had been transported to hospitals in other nearby cities.
Government planes brought food, water and medicine into Mocoa, which has had much damage to its infrastructure, including a loss of electricity.
tos, the area received 30% of the expected rain for the month in one night.