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Mexico City (CNN) -- A strong earthquake damaged hundreds of homes in southern Mexico Tuesday and rattled residents hundreds of miles away in the nation's capital.
The quake had a magnitude of 7.4, according to the U.S. Geological Survey, and its epicenter was about 15 miles (25 kilometers) east of Ometepec, Guerrero.
At least 500 homes in the southern coastal state were damaged, Gov. Angel Aguirre told reporters. There were no immediate reports of serious injuries or deaths.
Authorities were still surveying the area Tuesday evening, and reports differed about the extent of damage.
Officials reported that at least 800 houses had collapsed in the town of Igualapa, the Guerrero state government said in a statement. Later Tuesday, the head of Guerrero's civil protection department said state authorities had not yet surveyed the town or confirmed that report.
Quake strikes near Guerro-Oaxaca, Mexico
Guerrero residents felt aftershocks hours after the quake, which the USGS said had a depth of about 12.4 miles (20 km).
'Expect aftershocks from Mexico quake'
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
Earthquake rocks southern Mexico
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Earthquake rocks southern Mexico
"There are many cracked ceilings, many houses that collapsed," Francisca Villalva Davila, Ometepec's comptroller, told CNN en Español.
The USGS initially reported the magnitude of the quake at 7.9, but later revised that figure downward. Mexican President Felipe Calderon said in a Twitter post it was 7.8.
Residents rushed into the streets after feeling the temblor in Mexico City, about 200 miles (320 km) away from the epicenter. Tourists and residents also felt the earthquake in the resort city of Acapulco.
Calderon said that there were no immediate reports of serious damage, and that the nation's health system was operating normally.
"There are some broken windows, much fear, much panic," he said.
Residents in the southwestern states of Oaxaca and Guerrero and the eastern state of Veracruz reported that phone service had been knocked out.
Multiple houses collapsed in the Ometepec area, Aguirre told CNN affiliate Televisa.
Government helicopters were surveying the area, he said, and officials were preparing shelters for displaced residents.
Authorities in Mexico City were surveying buildings, schools and hospitals to evaluate damage, Mayor Marcelo Ebrard said.
Mexico quake among resident's 'Top 5'
A pedestrian bridge fell on a minibus during the quake, he said, but there were no injuries.
Some buildings had cracks and broken windows, he said in a Twitter post.
Earthquakes are a frightening experience for the more than 20 million residents of Mexico City, where about 10,000 people perished in the area after a massive quake in 1985.
The city, built on volcanic ash and clay, is particularly vulnerable to temblors.
A spokeswoman told reporters that U.S. President Barack Obama's eldest daughter, who was on a spring trip with classmates in Mexico about 100 miles away from the quake's epicenter, was not injured.
"In light of today's earthquake, we can confirm that Malia Obama is safe and was never in danger," said Kristina Schake, a spokeswoman for first lady Michelle Obama.
Residents comfort each other in the streets of Mexico City after the quake.
People seek safety on the streets of Mexico City.
A woman cries on the phone as people move to safety in Mexico City.
A man walks over debris from a building in Mexico City.
Employees check out the damaged facade of a building in Mexico City.
A young man carries his dog out of his home in Mexico City.
A man helps a woman to safety in Mexico City.
A man surveys the scene in Mexico City.
A couple embraces in the streets in Mexico City.
A member of the Mexican Red Cross assists a woman in Mexico City.
