A ferry carrying over 100 people capsized off the coast of Guyana on Saturday, authorities said Sunday. Rescue teams are searching for 66 passengers still missing, while 67 people have been rescued. The vessel, the MV Barima, was traveling from the capital, Georgetown, to the town of Port Kaituma in the Essequibo region. It had 133 people on board when it went down in the Atlantic Ocean. Guyana is a small English-speaking country on the northeast coast of South America. The cause of the accident is not yet known. Officials have not released details about the condition of those rescued or the nationalities of the passengers. The search operation continues, with boats and aircraft scouring the area. The MV Barima is an ageing ferry, and questions about its seaworthiness may arise. The Essequibo region is known for its oil and mineral wealth, but the disaster has overshadowed that. Families of the missing are gathering at ports, waiting for news. The government has promised a full investigation into the incident.