( CNN) Rescuer are combing the waters of a reservoir in northwest Colombia after a sightseer craft carrying 150 people sank, according to Colombian authorities.

Nine people have died, and more than 30 are missing, according to authorities in Antioquia, where the incident took place.

The head of the Antioquia’s Disaster Prevention Department told reporters that at least 100 people have been rescued. At least 21 are injured, police said.