You'll find that regular fertilizer has explosion retardant additives. Which made me think (and was confirmed later) that the Beirut explosion was 'weapons grad

You'll find that regular fertilizer has explosion retardant additives. Which made me think (and was confirmed later) that the Beirut explosion was 'weapons grade' ammonium nitrate, rather than the stuff sold to civilians. For instance; https://pubs.acs.org/doi/abs/10.1021/cen-v073n022.p006 https://pubs.acs.org/doi/abs/10.1021/cen-v073n022.p006