The secretary-general of the International Federation of Red Cross and Red Crescent Societies in Mozambique says the death toll following Cyclone Idai could exceed the 1,000 predicted by the country's president earlier this week.

Elhadj As Sy said humanitarian needs are great and "we will be seeing more in the weeks and months ahead, and we should brace ourselves."

The confirmed death toll in Zimbabwe, neighboring Mozambique and Malawi surpassed 500 on Thursday, with hundreds more feared dead in areas that were completely submerged.

An aerial view part of damaged city in Beira, Thursday, March 21, 2019. Hundreds are dead, many more missing and thousands at risk from massive flooding in Mozambique, Malawi and Zimbabwe caused by Cyclone Idai. (AP PhotoThemba Hadebe)

An aerial view part of damaged city in Beira, Thursday, March 21, 2019. Hundreds are dead, many more missing and thousands at risk from massive flooding in Mozambique, Malawi and Zimbabwe caused by Cyclone Idai. (AP PhotoThemba Hadebe)

Thousands of people were making a grim voyage toward the city of Beira in Mozambique, which although heavily destroyed is now a center for frantic rescue efforts. Some walked along roads carved away by the raging waters while others were ferried by local fishermen.

Pedestrians walk on the edge of a collapsed bridge in Nhamatanda, about 100km west of Beira, Thursday, March 21, 2019. Some hundreds are dead, many more still missing and thousands at risk from massive flooding across the region including Mozambique, Malawi and Zimbabwe caused by Cyclone Idai. (AP PhotoThemba Hadebe)

Pedestrians walk on the edge of a collapsed bridge in Nhamatanda, about 100km west of Beira, Thursday, March 21, 2019. Some hundreds are dead, many more still missing and thousands at risk from massive flooding across the region including Mozambique, Malawi and Zimbabwe caused by Cyclone Idai. (AP PhotoThemba Hadebe)

A woman carrying her child walks alongside a collapsed bridge in Nhamatanda, about 100km west of Beira, Thursday, March 21, 2019. Hundreds are dead, many more missing and thousands at risk from massive flooding in Mozambique, Malawi and Zimbabwe caused by Cyclone Idai. A week after Cyclone Idai lashed southern Africa, flooding still raged Thursday as torrential rains caused a dam to overflow in Zimbabwe, threatening riverside populations. The confirmed death toll in Zimbabwe, neighboring Mozambique and Malawi surpassed 500, with hundreds more feared dead in towns and villages that were completely submerged. (AP PhotoThemba Hadebe)

A woman carrying her child walks alongside a collapsed bridge in Nhamatanda, about 100km west of Beira, Thursday, March 21, 2019. Hundreds are dead, many more missing and thousands at risk from massive flooding in Mozambique, Malawi and Zimbabwe caused by Cyclone Idai. A week after Cyclone Idai lashed southern Africa, flooding still raged Thursday as torrential rains caused a dam to overflow in Zimbabwe, threatening riverside populations. The confirmed death toll in Zimbabwe, neighboring Mozambique and Malawi surpassed 500, with hundreds more feared dead in towns and villages that were completely submerged. (AP PhotoThemba Hadebe)