The deadliest industrial disaster in U.S. history occurred on April 16, 1947, in Texas City, Texas. When the French ship SS Grandcamp exploded, a thousand buildings were destroyed and hundreds of people were killed. Among the dead were the firefighters in the Texas City Fire Department. All of their firefighting equipment was destroyed, too, which made the city more vulnerable to the damage of the second explosion. Read the story in an article I wrote for mental_floss.