Hundreds of thousands of people have been displaced by Cyclone Idai after it tore through southern Africa. At least 1,000 people are feared dead.

Survivors clinging to tree branches and rooftops are still being rescued a week after the storm brought devastation to Mozambique, Malawi and Zimbabwe.

But aid has been slow to reach affected villages because of damage to infrastructure.

Idai smashed into the port city of Beira with winds of up to 105mph last Thursday, then tracked inland to Zimbabwe and Malawi, flattening buildings and endangering the lives of millions.

The cyclone’s torrential rains also flooded the banks of the Buzi and Pungue rivers. A UN satellite agency said floodwater covered 835 square miles on 20 March.

Cyclone wipes out 90% of city in Mozambique: in pictures Show all 15 1 /15 Cyclone wipes out 90% of city in Mozambique: in pictures Cyclone wipes out 90% of city in Mozambique: in pictures Residents are on a roof surrounded by flooding in Beira, Mozambique AFP/Getty Cyclone wipes out 90% of city in Mozambique: in pictures Chimanimani locals walk near one of the many roads that have been damaged by Cyclone Idai EPA Cyclone wipes out 90% of city in Mozambique: in pictures Praia Nova in Beira, Mozambique that has been devastated in Cyclone Idai EPA Cyclone wipes out 90% of city in Mozambique: in pictures Submerged area of Praia Nova in Beira, Mozambique EPA Cyclone wipes out 90% of city in Mozambique: in pictures Praia Nova in Beira, Mozambique that has been devastated in Cyclone Idai EPA Cyclone wipes out 90% of city in Mozambique: in pictures Locals stand beside a damaged section of road between Beira and Chimoio in Mozambique AFP/Getty Cyclone wipes out 90% of city in Mozambique: in pictures Pylons and telegraph poles amidst the flooded area outside Beira in Mozambique AFP/Getty Cyclone wipes out 90% of city in Mozambique: in pictures Praia Nova in Beira, Mozambique that has been devastated in Cyclone Idai Reuters Cyclone wipes out 90% of city in Mozambique: in pictures Damaged sports arena in the Ponta Gea area of Beira, Mozambique EPA Cyclone wipes out 90% of city in Mozambique: in pictures Submerged area of Bozi in the south of Beira, Mozambique AFP/Getty Cyclone wipes out 90% of city in Mozambique: in pictures A young man sits in front of destroyed settlements in Beira, Mozambique EPA Cyclone wipes out 90% of city in Mozambique: in pictures Residents carry their belongings through a flooded section of Praia Nova in Beira EPA Cyclone wipes out 90% of city in Mozambique: in pictures A man searches through the rubble in Beira, Mozambique EPA Cyclone wipes out 90% of city in Mozambique: in pictures Residents walk through a flooded area of Beira, Mozambique EPA Cyclone wipes out 90% of city in Mozambique: in pictures Locals queue to receive aid during search and rescue operations in the wake of Cyclone Idai in Chimanimani, Zimbabwe AFP/Getty

The cyclone also brought floods to the plains of central Mozambique, submerging entire homes, villages and towns.

Helicopters have this week been searching for survivors in the countryside near the worst-hit city of Beira, which has become the main headquarters of the rescue operation in Mozambique.

At least 242 people were killed in Mozambique, land and environment minister Celso Correira said. He added that the number of dead was expected to rise as floodwaters recede.

The extent of flooding, depicted in red, around the port town of Beira in Mozambique on 19 March (ESA)

Mr Correira also said around 15,000 people, many of them seriously ill, still needed to be rescued.

“Our biggest fight is against the clock,” he said, adding that 3,000 people had been rescued so far.

In Zimbabwe, the death toll jumped to 139. The United Nations World Food Programme (WFP), which is coordinating food drops, said 200,000 Zimbabweans would need urgent food aid for three months.

So far, 56 people have been confirmed dead in Malawi.

Aid organisations have provided food, water and clothing to those displaced by the tragedy.

The International Federation of Red Cross and Red Crescent Societies (IFRC) said it was sending two emergency units to Beira to provide drinking water for up to 15,000 people and sanitation facilities for 20,000 people, as well as shelter kits.

“More help is needed, and we are continuing to do all we can to bring in more resources and to reach more people,” said Jamie LeSueur, the IFRC’s operations head in Mozambique.

The WFP has stepped up airdrops of high-energy biscuits and water purification tablets to isolated pockets of people stranded by the floodwaters.

The UK government has pledged to match the first £2m donated by the public to the Disasters Emergency Committee and major broadcasters will air appeals in support of fundraising.

Cyclone Idai wreaks havoc across Zimbabwe

Britain has already announced an aid package of £18m for the region and the Department for International Development has chartered planes to help the government of Mozambique transport power generators to areas without electricity and support the delivery of easy-to-prepare fortified foods.

Four experts have also been sent from London to coordinate the disaster response on the ground.

Mozambique’s president Filipe Nyusi, who declared three days of national mourning starting on Wednesday, has said the eventual death toll from the cyclone and floods could rise to more than 1,000.