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This handout photo released by the Colombia Presidential Press Office, shows an aerial view of a portion of Mocoa, Colombia on April 1, 2017, after an avalanche of water from an overflowing river swept through the city as people were sleeping. Photo: AP

In this handout released by the Colombian National Army, soldiers carry a victim on a stretcher, in Mocoa on Saturday. President Juan Manuel Santos declared Mocoa a disaster area and said that at least 207 were killed but that the death toll was changing "every moment." Photo: AP

Rescuers walk in the river with chainsaws after flooding and mudslides caused by the heavy rains in Mocoa on Sunday. Authorities said another 200 people, many of them children, were injured and just as many were unaccounted for. Photo: Reuters

A man walks among the ruins after the havoc caused by flooding and mudslides. Mocoa is vulnerable to flooding. It is surrounded by the three rivers in a natural basin created by the surrounding mountains. Photo: Reuters

A soldier stands guard next to a damaged home in Mocoa on April 2, 2017. The crisis is likely to be remembered as one of the worst natural disasters in recent Colombian history, though the Andean nation has experienced even more destructive environmental catastrophes. Photo: AP

Firefighters search for survivors in Mocoa on Sunday. According to the Red Cross, 202 people were injured and 220 believed missing. Photo: AP

People walk over the debris of a collapsed building in Mocoa on Sunday. Survivors described gruesome scenes in the remote southern town, as rescuers kept up a bleak search for victims in the muck and debris. Photo: AP

Rescuers look for bodies in a river in Mocoa. The risk of a disaster has grown worse in recent years because of deforestation, which eliminates some protection from runoff, and many people had built their homes close to the water. Photo: Reuters

People wait to identify bodies of their relatives in a cemetery, in Mocoa on Sunday. While dozens stood at the door of a hospital, hoping for good news of family members who were not on the list of those confirmed dead or injured, others frantically knocked on relatives’ doors, hoping to find someone with information about their loved ones. Photo: Reuters

A man washes a shirt in muddy water in Mocoa, on Sunday. Health authorities said they had dispatched sanitation specialists in hopes of preventing epidemic outbreaks. Photo: AP