Firefighters and rescue workers walk through the scorched ground of the open-air San Pablito fireworks market, in Tultepec, outskirts of Mexico City, Mexico, Tuesday, Dec. 20, 2016. An explosion ripped through Mexico’s best-known fireworks market on the northern outskirts of the capital Tuesday, injuring scores and killing at least 9 people , according to Mexican Federal Police. (AP Photo/Eduardo Verdugo)