In this photo taken Friday, March 22, 2019, men retrieve the body of 17-year-old Agreement Munanga, who died last Friday after Cyclone Idai caused mudslides in Chimanimani, Zimbabwe. As flood waters began to recede in parts of Mozambique, Zimbabwe and Malawi fears rose that the death toll could soar as bodies are revealed. (AP Photo/KB Mpofu)

BEIRA, Mozambique (AP) — A second week has begun of efforts to find and help tens of thousands of people after Cyclone Idai devastated a large swath of Mozambique.

Members of the Indian and South African militaries are joining aid groups in flying over stretches of central Mozambique as they look for signs of life and people in need.

No one knows how many people are missing. More than 600 people are confirmed dead in Mozambique, Zimbabwe and Malawi. Aid workers say that number is certain to rise as flood waters recede.

The shattered Mozambican city of Beira and other communities are now home to crowded displacement camps, both organized and informal. With communications badly affected by the cyclone and some families separated in the chaos, a program aimed at reunification is now underway.

"Every day we discover that the destruction left by Cyclone Idai is worse than we imagined," Hicham Mandoudi, the International Committee of the Red Cross's head of sub-delegation in Beira, said in a statement. "We are deeply concerned about remote communities that are cut off by flooding and landslides and are yet to receive any humanitarian assistance. More rain is expected to come, which will compound the suffering of people who have already lost everything."

Mozambique's government has formally requested assistance from the international community, the U.N. humanitarian office said, opening the door to further aid efforts.

U.N. Secretary-General Antonio Guterres on Thursday appealed for stepped up support for victims of Idai, saying the U.N. and its humanitarian partners are scaling up the response but "far greater international support is needed."

The U.N. chief said in a statement that "with crops destroyed in the breadbasket of Mozambique more people are at risk of food insecurity in all three countries."

Beira, the city at the center of aid efforts for Mozambique, still can only be reached by land or sea. Local fishermen have joined the rescue efforts, ferrying stranded people about 50 or so at a time to the city's beach or port.

With mobile phone communications struggling to return, some residents have lined an overpass known for having a better chance of receiving a signal.

Prices of food and other basic items are doubling, even tripling. People wait in line outside stores, let in one by one in an effort to prevent looting.

Throughout the region, emergency air efforts focus on spotting stranded people and communities in the hope of dropping aid or plucking those in dire need to safety.

There are signs of life in the inundated landscape, even smoke from some cooking fires.

As waters recede, however, aid workers expect the death toll to rise as bodies are found.

With water and sanitation systems largely destroyed, waterborne diseases are also a growing concern.

An aerial photo shows local residents walk on a damaged road following the devastating Tropical Cyclone Idai in Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo)
Satellite image provided by DigitalGlobe, photo showing aerial view of Beira city, Mozambique, on the shores of the Indian Ocean, dated March 13, 2019, before the impact of cyclone Idai on the area.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
Flooding in Sofala Province in Mozambique.;
This Tuesday, March 19, 2019 photo taken from Copernicus Sentinel-1 and provided by the European Space Agency, ESA, shows the extent of flooding, depicted in red, around the port town of Beira in Mozambique. following cyclone force winds and heavy rain near the coastal city. (ESA via AP)
People pass through a section of the road damaged by Cyclone Idai in Nhamatanda about 50 kilometres from Beira, in Mozambique, Friday March, 22, 2019. As flood waters began to recede in parts of Mozambique on Friday, fears rose that the death toll could soar as bodies are revealed. (AP Photo/Tsvangirayi Mukwazhi)
Construction vehicles at work near a section of the road damaged by Cyclone Idai in Nhamatanda about 50 kilometres from Beira, in Mozambique, Friday March, 22, 2019. As flood waters began to recede in parts of Mozambique on Friday, fears rose that the death toll could soar as bodies are revealed. (AP Photo/Tsvangirayi Mukwazhi)
A man passes through a section of the road damaged by Cyclone Idai in Nhamatanda about 50 kilometres from Beira, in Mozambique, Friday March, 22, 2019. As flood waters began to recede in parts of Mozambique on Friday, fears rose that the death toll could soar as bodies are revealed. (AP Photo/Tsvangirayi Mukwazhi)
A villager sulvages what remains of a piece of clothing near a section of the road damaged by Cyclone Idai in Nhamatanda about 50 kilometres from Beira, in Mozambique, Friday March, 22, 2019. As flood waters began to recede in parts of Mozambique on Friday, fears rose that the death toll could soar as bodies are revealed.
(AP Photo/Tsvangirayi Mukwazhi)
Survivors of Cyclone Idai in an abandoned and derelict building near Nhamatanda about 50 kilometres from Beira, in Mozambique, Friday March, 22, 2019. As flood waters began to recede in parts of Mozambique on Friday, fears rose that the death toll could soar as bodies are revealed. (AP Photo/Tsvangirayi Mukwazhi)
An aerial photo shows a damaged factory following the devastating Tropical Cyclone Idai in Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo)
An aerial photo shows a truck as it manoeuvres on a damaged road following the devastating Tropical Cyclone Idai in Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo)
An aerial photo shows local residents standing near the end of a damaged road following the devastating Tropical Cyclone Idai in Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo)
Jessica Mhonderi stands in front of what used to be her son's home in Chimanimani. Zimbabwe, Saturday, March 23, 2019. Mhonderi lost her daughter-in-law and three grandchildren to the Cyclone Idai induced rains last week that swept through Mozambique, Zimbabwe and Malawi. (AP Photo/KB Mpofu)
Men search to salvage what they can from a house which was damaged by Cyclone Idai in Chimanimani, Zimbabwe, Saturday, March 23, 2019 after Cyclone Idai caused floods that swept through Mozambique, Zimbabwe and Malawi. A second week has begun of efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing.(AP Photo/KB Mpofu)
Men help each other salvage some household appliances from a house which was damaged by Cyclone Idai in Chimanimani, Zimbabwe, Saturday, March 23, 2019 after Cyclone Idai caused floods that swept through Mozambique, Zimbabwe and Malawi. A second week has begun of efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing.(AP Photo/KB Mpofu)
In this photo dated March 23, 2019, satellite image provided by DigitalGlobe, showing an aerial view of the city of Beira, on the shores of the Indian Ocean, Mozambique, after the cyclone impacted on the city.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
In this photo dated March 23, 2019, satellite image provided by DigitalGlobe, showing an aerial view of the city of Beira, on the shores of the Indian Ocean, Mozambique, after the cyclone impacted on the city.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
Images provided by satellite image provided by DigitalGlobe, combo photo showing aerial view of the city airport in Beira, Mozambique, showing the impact of cyclone Idai on the area, with top photo before the cyclone dated March 13, 2019, and photo below dated March 22, 2019.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
Satellite images provided by DigitalGlobe, combo photo showing aerial view of Beira city, Mozambique, on the shores of the Indian Ocean, showing the impact of cyclone Idai on the area, with left photo before the cyclone dated March 13, 2019, and photo at right after the cyclone dated March 23, 2019.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
Satellite image provided by DigitalGlobe, showing aerial view of the city airport in Beira, Mozambique, showing the impact of cyclone Idai on the area, dated March 22, 2019.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
Satellite image provided by DigitalGlobe, showing an aerial view of the city airport in Beira, Mozambique, dated March 13, 2019, before the impact of cyclone Idai on the area.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
In this photo dated March 23, 2019, satellite image provided by DigitalGlobe, showing an aerial view of the city of Beira, on the shores of the Indian Ocean, Mozambique, after the cyclone.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
In this photo dated March 23, 2019, satellite image provided by DigitalGlobe, showing an aerial view of the city of Beira, Mozambique, after the cyclone impacted on the city.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
In this photo dated March 23, 2019, satellite image provided by DigitalGlobe, showing an aerial view of the city of Beira, on the shores of the Indian Ocean, Mozambique, after the cyclone impacted on the city.  A second week has begun of efforts to find and help some tens of thousands of people after Cyclone Idai devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (DigitalGlobe, a Maxar company via AP)
In this photo taken Friday, March 22, 2019, a woman carries her food rations from a distribution center in Chimanimani, Zimbabwe. Zimbabwe. As flood waters began to recede in parts of Mozambique, Zimbabwe and Malawi fears rose that the death toll could soar as bodies are revealed. (AP Photo/KB Mpofu)
This photo taken Friday, March 22, 2019, women make their way to an emergency center in Chimanimani, Zimbabwe. As flood waters began to recede in parts of Mozambique, Zimbabwe and Malawi fears rose that the death toll could soar as bodies are revealed in the aftermath of Cyclone Idai. (AP Photo/KB Mpofu)
In this photo taken Friday, March 22, 2019, children cross a stream in Chimanimani, Zimbabwe. As flood waters began to recede in parts of Mozambique, Zimbabwe and Malawi fears rose that the death toll could soar as bodies are revealed. (AP Photo/KB Mpofu)
In this photo taken Friday, March 22, 2019, women wait for the funeral of 17-year-old Agreement Munanga, who died last Friday after Cyclone Idai caused mudslides in Chimanimani, Zimbabwe. As flood waters began to recede in parts of Mozambique, Zimbabwe and Malawi fears rose that the death toll could soar as bodies are revealed. (AP Photo/KB Mpofu)