2750 tons of AN perfectly mixed to make ANFO only gets you 2.2kt. So unless if the actual amount of AN was higher, or something else detonated with it, 2.2kt is

2750 tons of AN perfectly mixed to make ANFO only gets you 2.2kt. So unless if the actual amount of AN was higher, or something else detonated with it, 2.2kt is probably our theoretical ceiling.