KIGALI, Rwanda At least 52 people have been confirmed dead, and dozens remain missing after two passenger boats capsized on Lake Tumba in the western Democratic Republic of the Congo, officials said on Friday. The boats sank over night between Wednesday and Thursday near Bikoro, about 128 kilometers (79 miles) from Mbandaka in Equateur province. Dieu Merci Akula Mboyo, an official with the Provincial Coordination of the Panel of Experts of Civil Society in Equateur, said the provisional toll