Port-au-Prince, Haiti (CNN) -- Rescue workers struggled to clear rubble and bodies Wednesday from the streets of Haiti's "flattened" capital, where a government official said the death toll from Tuesday's 7.0-magnitude earthquake may exceed 100,000.
Thousands of injured people waited for care outside badly damaged hospitals, while an unknown number remained trapped inside collapsed buildings. Basic services like water and electricity were out, and Haitian President Rene Preval said his government needs help clearing streets so rescuers can reach some of the hardest-hit areas.
"We need medicine. We need medical help in general," Preval told CNN. "Some of the hospitals, they collapsed."
People were digging though the rubble of leveled buildings with their hands Wednesday, looking for survivors or bodies, CNN's Anderson Cooper reported from Port-au-Prince. Other CNN correspondents in Port-au-Prince and its suburbs reported whole blocks of collapsed buildings, with dozens of bodies piled in the streets.
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Video images captured just moments after the temblor show dust-covered survivors rushing through the streets, yelling in terror. Others trapped in buildings are seen punching out debris and bricks, and shouting for help and trying to squeeze themselves out through cracks in the structures.
Port-au-Prince "is flattened," said Haiti's consul general to the U.N., Felix Augustin, who said he believed more than 100,000 people were dead.
But Preval said other estimates ranged from 30,000 to 50,000.
"It's too early to give a number," Preval said.
Hear the prime minister describe the situation
The 7.0-magnitude earthquake struck shortly before 5 p.m. Tuesday, centered about 10 miles (15 kilometers) southwest of Port-au-Prince, the U.S. Geological Survey reported. It could be felt strongly in eastern Cuba, more than 200 miles away.
The earthquake's power matched that of several nuclear bombs, said Roger Searle, a professor of geophysics in the Earth Sciences Department at Durham University in England. He said the combination of its magnitude and geographical shallowness made it particularly dangerous.
About 3 million people -- one-third of Haiti's population -- were affected by the quake, the Red Cross said. About 10 million people most likely felt shaking from the earthquake, the U.S. Geological Survey said.