Around 40 people were killed when an overloaded truck laden with passengers ploughed into Africa's deepest lake. Territorial administrator for Uvira territory in South Kivu province, Wabunga Singa today said the truck plunged into Lake Tanganyika in eastern Democratic Republic of Congo, late yesterday. Singa said perhaps 40 people were dead and four escaped. He said the authorities were not sure of the exact number of casualties or about the number of people onboard the truck. Singa said the cause of the accident was not yet known. Road accidents are common in Congo. Last month, an oil tanker overturned in Uvira province, killing more than 270 after leaking fuel caught fire and exploded in the town of Sange.