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Even as the likelihood of finding people alive diminished with each passing hour, rescuers continued to free survivors from mountains of debris, offering anguished families reason to keep hopes alive. Aid agencies consider the first 48 to 72 hours after a natural disaster as crucial for retrieving people alive, though that can be extended if they have access to food and water.

Rescue workers from the U.S. and France pulled a man and his son from the ruins Sunday morning and carried them carefully on a black tarp into an ambulance. Masses of people gathered to watch the rescue as the survivors — covered in dust — were hydrated through an IV.

More than 2,200 rescue workers from across the world had arrived by Saturday, the U.N. said, and more were still arriving.

“It’s been incredibly hard work, but we’re going strong,” said Jason Mercano, a civilian who was able to communicate with family buried under the rubble via social media.

“We've never given up hope,” he added.

Tension mounts during rescue efforts

��ǻ��í���ܱ�� said on state television Saturday that more than 14,000 members of the military and police are patrolling the La Guaira state, where access is now blocked and special permits are required to enter.

Many in disaster zones said they had seen little of their government. But rescue efforts in La Guaira appeared more organized on Sunday than in the previous days.

The disaster poses a huge challenge for , the former vice president who took office in January after the U.S. capture and removal of then-President . Venezuela has been facing for more than a decade, and many people reject the legitimacy of .

Venezuela’s government said Sunday more than 770 buildings had totally or partially collapsed from the earthquake, twice as many as were reported destroyed or damaged on Friday.

Some people climbed the remnants of buildings and cried out names, hoping for any proof of life. Dust coated coastal communities. In punishing heat, more people wore masks as the stench of decomposition spread. In other parts of La Guaira, teams loaded stacks of bodies – some in white bags, other naked – onto white trucks from the ground of a dirt hospital parking lot, where they were being identified.

Without hard hats or other gear, rescuers and civilians instead wore motorcycle helmets as they searched piles of debris.

Some, frustrated by the government's response, blocked an excavator from leaving the site of a collapse and pulled the operator from its cabin shortly after state workers took selfies in front of flattened buildings and left without helping. The ruling party’s officials often take selfies to show participation in government-related events.

The International Organization for Migration said over 6 million people could be affected, some 2 million in the capital, Caracas, alone.

Experts said the destruction was amplified by the quick succession of shallow quakes. For days, smaller aftershocks occasionally shook the capital, Caracas and areas hit by the quakes, including one measuring 4.8 on Saturday.

Search teams and foreign aid continued to arrive from Mexico, the U.S., Brazil, El Salvador, France and elsewhere.

A glimmer of hope

For many, the images of international aid teams arriving and climbing through the rubble alongside them offered a glimmer of hope.

Yonahí Regalado has been calling out the names of her sister and 1-year-old nephew and godson since 1 a.m. the day after the earthquakes until aid workers began to arrive.

“It doesn’t matter who it is, whoever, whether it’s family or somebody else. If there is anyone alive, let’s get them out,” she said, as helicopters circled overhead.

Small moments of humanity mixed with grief and terror.

One video showed a Venezuelan rescuer comforting an elderly woman trapped beneath the rubble, scared that the structure would cave in if she moved.

“The roof won’t cave in. If it falls, I’ll be here with you,” he said.

Simón Bolívar International Airport, which serves Caracas, was badly damaged. One runway was operational as U.S. teams worked to repair the crucial throughway, Jeremy Lewin, a senior State Department official in charge of foreign assistance, told reporters.

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Janetsky reported from Mexico City. Associated Press journalists Matías Delacroix in La Guaira, Venezuela, Clara Preve in Buenos Aires, Argentina, and Ali Swenson in Washington, contributed to this report.