A woman reacts as a real quake rattles Mexico City on September 19, 2017 moments after an earthquake drill was held in the capital.
A 7.1 magnitude earthquake shook Mexico City on Tuesday, destroying buildings and causing an unknown number of casualties on the anniversary of a devastating 1985 quake. The quake sowed panic in the sprawling city of 20 million people, many of whom have memories of the quake 32 years ago that killed some 10,000 people in Mexico City.
 / AFP PHOTO / Ronaldo SCHEMIDT        (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)