AlQa'dah 19, 1436, September 03, 2015, SPA -- At least 18 people died when a pirogue carrying passengers on the River Niger in central Mali capsized on Wednesday, said a spokesman for the country's Department of Homeland Security and Emergency Preparedness, according to Reuters. There were four missing and 70 survivors from the accident that took place around 5 a.m. (0500 GMT) in the rural community of Deboye in Mopti region's Bangou locality, spokesman Sounkolo Togola told Reuters. A security source said overcrowding was a likely cause. Boats on Africa's lakes and rivers are often stacked with people and trade goods, and poor maintenance and overcrowding are a frequent cause of accidents.