Explosion at hospital in Mexico City
Rescuers arrive to work at the site of 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/RONALDO SCHEMIDT (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)
MEXICO CITY, MEXICO - JANUARY 29: Search and rescue workers head toward the site of an explosion at a children's hospital on January 29, 2015 in Mexico City, Mexico. Officials believe the explosion was caused by a leak from a gas truck. At least four people were killed and dozens injured. (Photo by Brett Gundlock/Getty Images)
MEXICO CITY, MEXICO - JANUARY 29: 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 leak from a gas truck. At least four people were killed and dozens injured. (Photo by Brett Gundlock/Getty Images)
Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015. Four babies and three adults were killed when a gas tank truck exploded outside a Mexico City children's hospital on Thursday, an official told AFP, raising the death toll from four. AFP PHOTO/RONALDO SCHEMIDT (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)
Hospital explosion in Mexico City
Rescue workers are seen at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
The explosion rocked the maternity hospital west of Mexico City Thursday when a leak from a gas truck ignited, destroying a large part of the building.
Hospital explosion in Mexico City
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 as the building partly collapsed.
Hospital explosion in Mexico City
Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015.
Hospital explosion in Mexico City
Relatives of victims cry at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
The explosion rocked the maternity hospital west of Mexico City Thursday when a leak from a gas truck ignited, destroying a large part of the building.
Hospital explosion in Mexico City
Police guard the entrance to the area where rescue workers were combing through the rubble of a children's hospital after a gas truck exploded, in Cuajimalpa on the outskirts of Mexico City, Thursday, January 29, 2015.
Hospital explosion in Mexico City
Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015.
Hospital explosion in Mexico City
Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, on January 29, 2015.
Hospital explosion in Mexico City
Rescue workers battle a fire at a children's hospital after a gas truck exploded, in Cuajimalpa on the outskirts of Mexico City, Thursday, January 29, 2015.
Hospital explosion in Mexico City
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, January 29, 2015.
Hospital explosion in Mexico City
Emergency responders work at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Rescuers work amid the wreckage caused by an explosion in a hospital in Cuajimalpa, Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Rescue workers are seen at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Rescue workers are seen at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Polices arrive at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015. The explosion rocked the maternity hospital west of Mexico City Thursday when a leak from a gas truck ignited, destroying a large part of the building.
Hospital explosion in Mexico City
Rescue workers are seen at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Police stand guard near the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Rescue workers are seen at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Rescue workers are seen at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.
Hospital explosion in Mexico City
Rescue workers are seen at the site of an explosion at a maternity hospital in Mexico City, January 29, 2015.