Relatives of missing people wait for news in front of a collapsed building in Mexico City on Friday, September 22. A magnitude 7.1 quake hit central Mexico three days earlier. YURI CORTEZ/AFP/AFP/Getty Images

Rescue workers search for survivors Thursday, September 21, at a collapsed apartment building in Mexico City. Natacha Pisarenko/AP

A religious statue is salvaged from a former convent that was heavily damaged in Tlayacapan, Mexico. This was the second earthquake to hit Mexico in two weeks. A magnitude 8.1 quake struck off the country's southern coast on September 8. Eduardo Verdugo/AP

A wall is damaged at a home in Tlayacapan on Wednesday, September 20. Eduardo Verdugo/AP

Volunteers organize donations in Mexico City on September 20. The Washington Post/Getty Images

Rescuers in Mexico City work to save a child trapped inside the Enrique Rebsamen elementary school on September 20. Rescue workers said they believed they'd made contact with a girl trapped in the rubble at the school. But by the next afternoon, navy official Angel Enrique Sarmiento said all the school's children had been accounted for and there was no student in the rubble. He apologized for the confusion. Marco Ugarte/AP

Men carry beams of wood to offer help in Mexico City's Roma neighborhood on September 20. Rebecca Blackwell/AP

Families prepare to sleep under tarps outside their quake-damaged building in Mexico City on September 20. Rebecca Blackwell/AP

Rescuers and firefighters lower a corpse from a house in Mexico City on September 20. VICTOR GALINDO/AFP/Getty Images

Volunteers and rescue workers search for people trapped inside the Enrique Rebsamen school on September 20. Miguel Tovar/AP

A volunteer in Mexico City asks for silence as a flattened building is searched for survivors on September 20. ALFREDO ESTRELLA/AFP/Getty Images

Members of the Mexican Army nap September 20 after assisting in search-and-rescue missions in Mexico City. Gary Coronado/Los Angeles Times via Getty Images

People look for survivors in Mexico City on September 20. Francois Pesant/Polaris/Newscom

A man walks his bike past a partially collapsed building in Jojutla on September 20. Eduardo Verdugo/AP

Volunteers arrange food and other donated supplies at a distribution point in Mexico City on September 20. RONALDO SCHEMIDT/AFP/Getty Images

Children's toys are seen in a damaged building in Mexico City on September 20. ALFREDO ESTRELLA/AFP/Getty Images

A survivor is pulled out of rubble in Mexico City on September 20. PEDRO PARDO/AFP/Getty Images

People sleep on the street next to damaged homes in Jojutla on September 20. Eduardo Verdugo/AP

Soldiers remove debris from a collapsed building in Mexico City on September 20. Manuel Velasquez/Anadolu Agency/Getty Images

An injured person is carried away after being rescued in Mexico City on Tuesday, September 19. The earthquake happened on the anniversary of a 1985 quake that killed an estimated 9,500 people in and around Mexico City. Miguel Tovar/AP

Rescue workers remove rubble from a Mexico City building on September 19. RONALDO SCHEMIDT/AFP/Getty Images

Rescue workers in Mexico City search for people trapped inside the collapsed Enrique Rebsamen school on September 19. Carlos Cisneros/AP

A man comforts a student outside a school in Mexico City on September 19. Rebecca Blackwell/AP

A police officer runs toward the site where a building collapsed in Mexico City on September 19. YURI CORTEZ/AFP/Getty Images

Rescue workers and volunteers search a collapsed building in Mexico City on September 19. Eduardo Verdugo/AP

A man is rescued under rubble in Mexico City's Condesa area on September 19. Pablo Ramos/AP

A woman's crushed body hangs from a collapsed building in Mexico City on September 19. Marco Ugarte/AP

Recovery efforts take place at the collapse of a residential building in Mexico City on September 19. Courtesy Lior Sperandeo/CNN Exclusive

The quake damaged the Jojutla Municipal Palace. Carlos Rodriguez/AP

A search goes on at the scene of a collapsed building in Mexico City's Del Valle neighborhood on September 19. Miguel Tovar/AP

Emergency workers remove debris as they search for survivors in Mexico City on September 19. RONALDO SCHEMIDT/AFP/Getty Images

People react in Mexico City just after the quake hit. Ronaldo Schemidt/AFP/Getty Images

People gather on a Mexico City street after office buildings were evacuated because of the quake. Rebecca Blackwell/AP

A building is damaged in Mexico City on September 19. Rebecca Blackwell/AP

A woman in Mexico City cries as she tries to reach people on her cell phone after the quake. Marco Ugarte/AP

Patients from a Mexico City hospital receive treatment outside after the hospital was evacuated on September 19. Jose Mendez/EPA

A woman in Mexico City reacts after the quake. Ronaldo Schemidt/AFP/Getty Images

People remove debris off a building that collapsed in Mexico City. Alfredo Estrella/AFP/Getty Images

A car is crushed by debris in Mexico City on September 19. Alfredo Estrella/AFP/Getty Images

A woman receives medical assistance after she was injured in Mexico City on September 19. Omar Torres/AFP/Getty Images