(( FreedomsPhoenix Reader:
As the article explains, thermobaric explosive devices are exceedingly rare in non-military hands. I can tell you that only in recent decades have thermobaric projectiles (for PRGs or tanks) been devised and fielded. Larger and cruder ones have been used as far back as Vietnam, but they were rare even then.
The article explains there is no way someone like Warner succeeded on his first attempt making one of these, and there should be evidence of having been actively tinkering and exploding them in order to figure out how to do it. I agree.
In usual circumstances, the first assumption about who made such a device would immediately fall upon those with professional military ordnance expertise. No one is suggesting that Warner ever had that. While he was skilled enough in electronics to build sophisticated circuitry and therefor perhaps triggers or timers,…chemical engineering is something else. ))
Find his test sites, top bomb experts say.
Anthony Quinn Warner's device, although probably made of common over-the-counter components, is unique in the annals of mayhem, according to seasoned FBI bomb experts consulted by SpyTalk.
"We've never seen an improvised thermobaric device before in this country or any country," says Dave Williams, who conducted the FBI's on-scene investigations of the World Trade Center, Oklahoma City, Pan Am 103 and Unabomber bombings, among other notorious incidents. Thermobaric refers to a gaseous fuel-air explosion.
"The reason is, it's very difficult to get the timing down to get an optimum mixture of air and a liquified carbonaceous fuel such as propane, methane, acetylene or natural gas," Williams told SpyTalk. "He couldn't have done it the first time and made it work. There had to be a test area."
Accidental thermobaric explosions are not uncommon—for example, when a house explodes because of a natural gas leak. But IED-makers haven't tried to stage them deliberately, up to now, Williams says, because too many things have to go right.
That's why investigators must be eager to locate Warner's proving ground, and also any internet sources he studied as he was building a timer and ignition mechanism that enabled him to blow up a Nashville city block, and himself, at 6:30 a.m. on Christmas Day.