Powerful tropical Cyclone Freddy tore through parts of Madagascar on Wednesday, killing at least four people on the Indian Ocean island, disaster management authorities said. The storm has affected 16,600 people, according to the country's National Risk Management Office (BNGRC).   The U.N.'s World Food Program (WFP) estimates more than 2.3 million people in Madagascar could be affected by Freddy and that the cyclone will then pass through Mozambique and Zimbabwe on the African mainland.