At least 43 children were among the victims, Colombia's national disaster agency, NGRC, said.
In a speech on Sunday, Santos said that heavy rain unleashed flooding and landslides of \"unprecedented\" force that swept away \"whole neighborhoods\" and destroyed the city's main electric plant and water supply.
Officials said electricity has been partly restored to the ravaged city and 20 tons of aid supplies have arrived, but many residents struggled to get clean water, creating a potentially serious health hazard for the survivors.
Santos announced the \"immediate\" start to work on a new aqueduct to deliver potable water to the city.
More than 500 people remained displaced on Sunday evening. At least 200 people sustained injuries in the disaster, which affected at least 300 families, according to officials.
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