Any idea how much TNT 2700 tons of ammonium nitrate is equivalent to? That's a really big bomb...
The relative effectiveness of Ammonium Nitrate is 0.42. So 2700 tons would be equivalent to 1,134 tons of TNT.
Now if the ammonium nitrate was contaminated with a combustible, such as fuel then the effectiveness is more.
ANFO (94% AN + 6% fuel oil) has a relative effectiveness of 0.74 or equivalent to 1,998 tons of TNT.