Dhaka, Dhu-AlHijjah 19, 1437, September 21, 2016, SPA -- At least 13 people are dead and several others missing after a passenger boat sank in a southern Bangladesh river, police said on Wednesday according to dpa. Rescuers retrieved the bodies from the Shandhya River after the boat capsized with roughly 60 passengers on board, district police chief SM Akhteruzzaman told dpa by phone. Four people were rescued alive, the police chief said. He added that most of the passengers had been able to swim ashore. The engine-propelled boat, the ML Oishi, went down when it was about to anchor at Dasherhaat station. Akhteruzzaman estimated that some 10 others may still be missing. Divers from the Fire Service and Civil Defence and Bangladesh's Inland Water Transport Authority launched a rescue operation immediately after the accident, he said. The reason behind the accident could not be determined immediately, but an official at Barisal Port Authority said that the boat was overcrowded with passengers when it sank. The government launched an investigation into the accident. --SPA 18:22 LOCAL TIME 15:22 GMT www.spa.gov.sa/w