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Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. A gas explosion ripped through a children's hospital in Mexico City on Thursday, killing at least two people and injuring dozens, including 22 children, officials said. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537281080 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280500 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280546 )

A woman injured by an explosion at a hospital lies on a stretcher in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537279887 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280477 )

Relatives and friends wait outside the police cordon where a gas truck exploded at a maternity and children's hospital in Cuajimalpa, a Mexico City borough, Thursday, Jan. 29, 2015. A powerful gas tank truck explosion shattered the hospital on the western edge of Mexico's capital, killing at least three adults and one baby and injuring dozens. (AP Photo/Rebecca Blackwell) ( Mexico Hospital Explosion )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280490 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280509 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280510 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280515 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280522 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280530 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280534 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537280527 )

A firefighter who had been working on the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, is examined by a Red Cross paramedic on January 29, 2015. A gas explosion ripped through a children's hospital in Mexico City on Thursday, killing at least two people and injuring dozens, including 22 children, officials said. AFP PHOTO/DAVID DEOLARTE/AFP/Getty Images ( 537281087 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282217 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282145 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282210 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282141 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. A gas tank truck blew up outside a children's hospital in Mexico City on Thursday, killing at least four people and injuring dozens, including 22 children, as the building partly collapsed. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282138 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282117 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. A gas tank truck blew up outside a children's hospital in Mexico City on Thursday, killing at least four people and injuring dozens, including 22 children, as the building partly collapsed. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282113 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. A gas tank truck blew up outside a children's hospital in Mexico City on Thursday, killing at least four people and injuring dozens, including 22 children, as the building partly collapsed. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537282084 )

Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. A gas tank truck blew up outside a children's hospital in Mexico City on Thursday, killing at least four people and injuring dozens, including 22 children, as the building partly collapsed. AFP PHOTO/RONALDO SCHEMIDT/AFP/Getty Images ( 537281970 )

Rescue workers comb through the rubble of a children's hospital after a gas truck exploded, in Cuajimalpa on the outskirts of Mexico City, Thursday, Jan. 29, 2015. (AP Photo/Rebecca Blackwell) ( APTOPIX Mexico Hospital Explosion )

Police guard the entrance to the area where rescue workers combed through the rubble of a children's hospital after a gas truck exploded, in Cuajimalpa on the outskirts of Mexico City, Thursday, Jan. 29, 2015. (AP Photo/Rebecca Blackwell) ( Mexico Hospital Explosion )

Search and rescue workers inspect the rubble of an explosion at a children's hospital on January 29, 2015 in Mexico City, Mexico. Officials believe the explosion was caused by a gas truck running into the hospital. (Photo by Brett Gundlock/Getty Images) ( 462467994 )

Police climb over a wall, as they work to cordon off an area where rescue workers comb through the rubble of a children's hospital after a gas truck exploded, in Cuajimalpa on the outskirts of Mexico City, Thursday, Jan. 29, 2015. (AP Photo/Rebecca Blackwell) ( Mexico Hospital Explosion )

Rescue workers comb through the rubble where a gas truck exploded at a maternity and children's hospital in Cuajimalpa, a Mexico City borough, Thursday, Jan. 29, 2015. (AP Photo/Rebecca Blackwell) ( Mexico Hospital Explosion )

Search and rescue workers inspect the rubble of an explosion at a children's hospital on January 29, 2015 in Mexico City, Mexico. Officials believe the explosion was caused by a gas truck running into the hospital. (Photo by Brett Gundlock/Getty Images) ( 462467978 )