Updated at 2:56 a.m. ET: A strong magnitude-7.4 earthquake struck off the coast of El Salvador late Sunday, temporarily sparking a tsunami warning.

The earthquake was followed an hour later by a second, magnitude-5.4 temblor, authorities said.

However, the tsunami warning covering Costa Rica, Nicaragua, El Salvador, Honduras, Guatemala, Panama and Mexico was later canceled. 

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There were no immediate reports of damages or injuries.

David Walsh, an oceanographer with the Pacific Tsunami Center in Ewa Beach, Hawaii, said a minor, 7.8-inch swell was registered off Acajutla, El Salvador.

The earthquake struck 74 miles south of Usulutan, El Salvador, the U.S. Geological Survey reported on its website.

The temblor took place at a depth of 32.9 miles at 10:37 p.m. Sunday.

On Sunday, dozens of small to moderate earthquakes struck southeastern California, knocking trailer homes off their foundations and shattering windows in a small farming town east of San Diego. The largest quake registered at a magnitude 5.5 and was centered about three miles (five kilometers) northwest of the town of Brawley, according to the USGS. Another quake about an hour and a half earlier registered at magnitude 5.3. No injuries were reported.

The Associated Press and Reuters contributed to this report.

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Argentinian forensic experts have traveled to southern Mexico to exhume 96 bodies thought to be those of Central Americans who died as they tried to get to the United States, according to local reports. 

Six experts from The Argentine Forensic Anthropology Team (EAAF) are working with local and federal authorities in the cities of Tapachula and Ciudad Hidalgo in the state of Chiapas, Mexico's Proceso magazine reported on Monday. (Link to story in Spanish)

The EAAF team, which plans to spend at least two months in Chiapas, arrived on Monday at a municipal cemetery in the city of Tapachula, along with medical, human rights and justice officials, as well as representatives of the Guatemalan, Honduran and Salvadoran consulates, Proceso added.

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The EAAF was asked to help identify the bodies in Chiapas -- the majority of which were placed in one communal grave by local medical officials -- by groups advocating for the rights of migrants, Proceso reported.

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In most of Mexico, the bodies of indigent or unidentified people who have died in care are buried in group graves, with five to 10 corpses placed on each level, according to a Mexico forensics expert who asked not to be identified.  

Non-governmental EAAF was established in 1984 to investigate the cases of some 9,000 disappeared people in Argentina under the military government that ruled from 1976 to 1983. It now works around the world. 

The teams will analyze DNA samples from the buried bodies and those provided by families searching their missing loved ones, Proceso reported. The cemeteries are on routes known to be used by Central American migrants.

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The organization Voces Mesoamericanas (Mesoamerican Voices) requested the government of Chiapas look in the tombs for many missing migrants, the magazine said.  

The organization has also looked along the so-called migrant route for clues to the location of some 2,000 migrants thought to have died along the way to the United States, Proceso said. 

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It isn't known how many of the estimated 500,000 Central American migrants who pass through Mexico on their way to the United States actually make it to their destination, according to the Council on Hemispheric Affairs.

Many migrants are preyed on by criminal gangs and suffer assault, sexual slavery, kidnapping and murder, the organization added.

The EAAF, Mesoamerican Voices and local officials in Chiapas were not immediately available for comment.  

NBC News' F. Brinley Bruton contributed to this report.

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SAN SALVADOR -- No one was murdered in El Salvador on Saturday, officials said, in what was the first homicide-free day in nearly three years for the Central American country plagued by violent drug gangs.

"After years when the number of murders reached alarming levels of up to 18 per day, we saw not one homicide in the country," President Mauricio Funes said in a statement released on Sunday.

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The murder-free day was the first recorded since leftist Funes took office in June 2009. At the beginning of his term, the country had an average of 12 murders a day, but that tally climbed closer to 18 per day in early 2012.

Rival gangs operating in El Salvador called a truce last month and bloodshed between the country's two most powerful gangs, Mara Salvatrucha and gang Mara 18, has abated.

According to United Nations data, El Salvador has recently tallied a homicide rate of 66 per 100,000 people, one of the highest in the world.

Much of that violence is blamed on Mexican drug cartels that use the country as a transit point.

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Funes, who attended this weekend's Summit of the Americas in Cartagena, Colombia, credited his government's security measures for the drop in violence.

Funes has recently ordered the military to pick up routine security duties.

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