Mozambican President Filipe Nyusi is to address the nation Wednesday about how his government is responding to the devastation caused by Cyclone Idai, which has killed more than 460 people in his country and made 1.8 million people in need of urgent help.

Nyusi last week estimated that 1,000 people had been killed by the cyclone, after he flew over the vast expanses of the flooded plains of central Mozambique. The death toll could be higher than 1,000 said emergency workers, who add that the actual figure may never be known.

Health workers are opening clinics across the hard-hit city of Beira to try to reduce the threat of cholera and other waterborne diseases.