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Hani Mohammed, Associated Press
Shiite rebels known as Houthis hold up their weapons to denounce the Saudi-led airstrikes as they chant slogans during a protest in Sanaa, Yemen, Monday, April 27, 2015. Saudi-led airstrikes on Monday targeted Shiite rebels across Yemen, killing several people in the southern port city of Aden and striking a weapons depot in the rebel-held capital, officials and witnesses said.

SANAA, Yemen — Yemen's exiled government on Monday declared three areas in the country engulfed in fighting between Shiite rebels, their allies and pro-government forces as "disaster" zones, including the southern port city of Aden, and said that the month of violence has claimed 1,000 civilian lives.

The crisis in Yemen, the Arab world's most impoverished country, deepened since March 26, when a Saudi-led coalition launched airstrikes aimed at rolling back territorial gains by the Shiite rebels, known as Houthis, and their allies, loyalists of ousted President Ali Abdullah Saleh.

The country's internationally recognized President Abed Rabbo Mansour Hadi fled last month to Riyadh and his government now operates from the Saudi capital.

On Monday, the government raised the alarm for Aden as well as the cities of Taiz and Dhale, saying there is no electricity or water there and that these cities have run out of fuel, medical and food supplies.

"These cities are on verge of collapse," said Minister of Communications Nadia Saqqaf.

The three cities have also been the aim of a pressing offensive by the Houthis and Saleh's forces. While they have resisted the rebels' assault, pro-government forces, consisting mainly of poorly-armed and lightly-equipped militias, have failed to protect civilians caught in the cross-fire.

Saqqaf said nearly a quarter million Yemenis, out of a population of 25 million, have been displaced. On average, 15 people are killed by sniper fire or random shelling daily in Aden, he said.

The exiled government also said the civilian casualty toll for the past month is 1,000 — double the number U.N. agencies announced days ago.

Last week, Rupert Colville, a spokesman for the U.N. High Commissioner for Human Rights, said 551 civilians have been killed and 1,185 wounded in the violence between March 26 and April 22. The total death toll, including both combatants and civilians is 1,080, the U.N. said.

The deaths, the agency said, resulted from both airstrikes and fighting on the ground. The discrepancies in the casualty figures provided by the exiled government and the U.N. agencies could not immediately be reconciled.

Another minister in exile, Ezz Eddin al-Asbahi, said the Houthis and Saleh's forces are turning hospitals, clinics and schools into weapons caches, which makes them target of Saudi-led airstrikes. Al-Asbahi, who is the human rights minister, said 9 million Yemenis are in need of some form of medical intervention.

The Houthis have imposed a siege of Aden, cutting of fuel supplies, leaving large parts of the city in darkness. And because there is no fuel, hospital generators cannot work, al-Asbahi added.

A total of 365,000 houses have been destroyed across Yemen and the number of displaced nationwide has reached 250,000, he said.

"It's miserable," al-Asbahi said. "Yemen has gone back 100 years."

Also Monday, Saudi-led airstrikes targeted Shiite rebels across Yemen, killing at least at least five people in Aden and striking a weapons depot in the rebel-held capital, Sanaa, officials and witnesses said.

The five victims in Aden were buried in the rubble when an airstrike hit two houses. The airstrikes in Aden also targeted a hill where the presidential palace is located and a separate gathering of Houthis and Saleh's forces.

The airstrikes in Sanaa hit the Fag Atan mountain, where major arms depots are located, including those officials have said were used to store ballistic missiles. At least 38 people were killed when similar air raids last week flattened nearby homes, burying residents under the rubble.

Saudi-led warplanes also carried out raids in the northern city of Saada and the western city of Taiz.

The officials spoke on condition of anonymity because they were not authorized to speak to the media. The witnesses insisted on anonymity, fearing for their own safety.