Cyclone Idai has caused massive damage in Malawi, Mozambique and Zimbabwe, killing more than 150 people.
Mozambique's central port city of Beira was hardest hit, with nearly 90 per cent of the area destroyed.
"I think this is the biggest natural disaster Mozambique has ever faced. Everything is destroyed. Our priority now is to save human lives," said Mozambique’s environment Minister Celso.
UN agencies and the Red Cross have stepped up rescue efforts, and are using helicopters to deliver food supplies and medicines.

US, German scientists win Nobel medicine prize for work on light and brain
Nigeria military aircraft crashes with 32 aboard
At least 22 dead after boats collide on Congo river
Spanish PM Sanchez calls snap election for November 29
Hundreds of French schools stay closed ahead of nationwide day of student protests