Photos: Mexico fireworks blast

A no smoking sign stands above the scorched rubble of the open-air San Pablito fireworks market that exploded in Tultepec on the outskirts of Mexico City, Wednesday, Dec. 21, 2016. The market was especially well stocked for the holidays and bustling with hundreds of shoppers when a powerful chain-reaction explosion ripped through its stalls on Tuesday, killing dozens of people and leaving others badly burned.

Relatives grieve by the corpse of victim of a blast in a fireworks market in Mexico City on Dec. 20, 2016.

A man empties a fire extinguisher over the smouldering ruins left by a blast in a fireworks market in Mexico Cit, on Dec. 20, 2016.

A firefighter works amid the debris left by a huge blast that occured in a fireworks market in Mexico City on Dec. 20, 2016.

Firefighters work amid the debris left by a huge blast that occured in a fireworks market in Mexico City on Dec. 20, 2016.

Soldiers search amid the debris left by a huge blast that occured in a fireworks market in Mexico City on Dec. 20, 2016.

Soldiers search amid the debris left by a huge blast that killed at least 26 people in a fireworks market near Mexico City on Dec. 20, 2016.

Firefighters and rescue workers comb through ashes and rubble at the open-air San Pablito fireworks market in Tultepec, on the outskirts of Mexico City on Dec. 20, 2016.

Firefighters, rescuers and survivors search amid the debris from a blast in a fireworks market near Mexico City on Dec. 20, 2016. The explosion killed at least 26 people and injured dozens more, according to police.

Firefighters work amid the debris left by a huge blast in a fireworks market on the outskirts of Mexico City on Dec. 20, 2016.

The destruction left behind after a blast at a fireworks market near Mexico City on Dec. 20, 2016.

Firefighters work amid the debris of a blast in a fireworks market near Mexico City on Dec. 20, 2016.

Firefighters work amid the debris of a blast in a fireworks market near Mexico City on Dec. 20, 2016.

A local resident dressed as a clown helps a firefighter at the scene of an explosion at a fireworks market in Tultepec, Mexico, on Dec. 20, 2016.