The Kansas City, Missouri Fire Department lost six firefighters and their vehicles - two entire pumper companies - in an explosion that occurred while they were extinguishing a fire at a construction site. The fire involved a trailer/magazine containing blasting mixtures of ammonium nitrate and fuel oil, most containing aluminum pellets, too. The fire also involved two other vehicles and ultimately a second trailer/magazine that also exploded. A summary of the incident's key issues is present in table form on the following pages. The firefighters were not told specifically what was in the trailer/ magazine, but had been cautioned by the dispatcher about explosives on the site. Exactly what they suspected was in the trailers will probably never be known.