At least six people died when a passenger boat sank on a reservoir in north-western Colombia. Colombian officials said at least six people are dead and 31 missing after a four-story ferryboat with about 170 passengers capsized on the Penol-Guatape reservoir near city of Medellin yesterday. <br/><br/>Colombian President Juan Manuel Santos, said there are six people deceased so far. He was speaking to reporters at the scene of the sinking. Earlier officials said at least 9 people were dead in the accident. <br/><br/>Rescue teams, including air force pilots and firefighters are searching for survivors at the reservoir. Guatap' is a popular Andean resort town, known for its water sports and recreational activities.