It was ammonium nitrate, not dynamite or TNT as initially reported. But still that is a huge explosion! http://www.azcentral.com/news/articles/0911mexico-truck0911.html
Trucks collide, cargo explodes; 28 killed, 150 injured in Mexico
Sept. 11, 2007 12:00 AM
PIEDRAS NEGRAS, Mexico - A truck carrying ammonium nitrate to a mine caught fire after a highway crash and blew up, killing at least 28 people and injuring about 150, state and federal officials reported Monday.
Authorities said two trucks smashed into each other Sunday night on a busy highway in northern Mexico, drawing a crowd of curious onlookers as well as a small army of police, soldiers, emergency officials and journalists.
Shortly after the crowd arrived, the wreckage caught fire, and the ammonium nitrate exploded, sending a ball of fire into the sky that consumed nearby cars and left a 10- by 40-foot crater in the road.
Officials said they did not know what caused the initial crash.
The dead included three newspaper reporters from the nearby city of Monclova who were covering the wreck, said Luis Horacio de Hoyos of the Coahuila state Attorney General's Office.