At least 22 people were killed Tuesday, December 20, 2016 in an explosion at a fireworks market in Tultepec, Mexico, according to local authorities with firsthand knowledge of the search-and-rescue effort. At least 22 people were killed Tuesday, December 20, 2016 in an explosion at a fireworks market in Tultepec, Mexico, according to local authorities with firsthand knowledge of the search-and-rescue effort.