The bags say "NITROPRILL HD," which may be a knock-off of Nitropril made by Orica.
Orica sets the TNT equivalence for fire at 15 percent.
.15 x 2750 = 412.5
One more data point that suggests the explosion was a few hundred tons. https://t.co/ucuHdpazm3

— Jeffrey Lewis (@ArmsControlWonk) August 4, 2020