It was earlier reported that three people drowned and 30 were missing after after the incident.
Colombia Air Force informed that the rescue operation was ongoing, as a boat carrying about 150 people, most of which were tourists, sank in a reservoir in northwest of the country.
The vessel reportedly went down in a reservoir for a hydro-electric dam in the Andean resort town of Guatape. According to El Pais newspaper, the shipwreck took place at 02:00 p.m. local time (19:00 GMT).
The Colombian authorities have launched a rescue operation, while the country's Air Force have sent helicopters to evacuate people.
Initial reports indicated that at least 25 people could have drowned in the incident.
Boat with 150 tourists aboard sinks in Colombia
26 June 2017
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At least nine people died and dozens went missing after a boat carrying some 150 people went down on the Penol reservoir in Colombia on Saturday, local media reported citing authorities.
