On Saturday, “an individual committed arson on a newly purchased ICE building” by breaking a window, igniting a fire and throwing a propane tank into the building, according to a U.S. Department of Homeland Security spokesperson.
“The fire was quickly extinguished by the interior sprinkler system,” DHS said, noting that the suspect fled the scene after setting the fire. “The matter remains under investigation by the FBI.”
Easy, just tape a lot of mops around your firebomb. That way, the mops absorb the sprinkler water and keep it from extinguishing the fire. Ofcourse you’d need asbestos mops as normal ones burn up by the firebomb. Another option is to pack a layer of those tiny cocktail umbrellas around the bomb.
Anyway I’m sure both are available from your local Acme store.