Mozambique's President Filipe Nyusi and Zimbabwean President Emmerson Mnangagwa both returned from foreign trips to attend to the emergencies caused by the storm.
"Officially, we have a record of more than 84 dead but everything indicates that we can have a record of more than 1,000 dead", Nyusi said, adding that "100,000 people are in danger".
Responding to a question that the country was ill prepared for the disaster Chamisa said the country was not caught unaware but was ill prepared.
In Zimbabwe, at least 98 people have died and 217 people are missing in the east and south, the government said.
"The waters of the Pungue and Buzi rivers overflowed, making whole villages disappear and isolating communities, and bodies are floating", said Nyusi.
"The scale of damage".
Caroline Haga, a senior International Federation of the Red Cross official who is in Beira, said the situation could be far worse in the surrounding areas, which remained completely cut off by road and where houses were not as sturdy.
"The situation is bad". The scale of devastation is enormous. "It seems that 90 percent of the area is completely destroyed".
"Almost everything has been affected by the calamity", Alberto Mondlane, the governor of Sofala province, which includes Beira, said on Sunday.
Roads, homes and bridges have been swept away, and power and communication lines destroyed.
Denis Onyodi International Red Cross An aerial view of the destruction of homes after Tropical Cyclone Idai in Beira Mozambique
People carry their persinal effects through a flooded section of Praia Nova in Beira.
Emma Beaty, coordinator of a grouping of NGOs known as Cosaco, said: "We've never had something of this magnitude before in Mozambique". "Some dams have yielded while others have reached full capacity. Going forward, the depression is expected to be controlling the weather over much of the country".
Heavy rains are forecast to continue into the middle of the week, bringing more flooding and making it hard to reach stranded communities in both Mozambique and Zimbabwe.
Roads and bridges have been severely damaged while thousands of people have been left homeless after their homes collapsed in the driving rains and floods.
In Zimbabwe, an additional 70 people were confirmed dead on Sunday, according to government officials. "Many drowned while others were killed in their sleep from swift and unexpected rockfalls which demolished their homes".
The Acting Minister of Defence Retired Air Chief Marshal Perrance Shiri said they have called in all army engineers from across the country to help in the situation.
"This is the worst infrastructural damage we have ever had", Zimbabwe's Transport and Infrastructural Development Minister Joel Biggie Matiza said.
Idai tore into the centre of the country on Thursday before continuing on to Zimbabwe, bringing flash floods and ferocious winds, washing away roads and houses.
Nyusi was speaking after taking a flight over affected areas to view the destruction and rescue efforts.
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