The Wikipedia link mentioned above claims only 2.9 kilotons, rather than thousands of kilotons. I'm not sure how AN compares to TNT, but there were reportedly

The Wikipedia link mentioned above claims only 2.9 kilotons, rather than thousands of kilotons. I'm not sure how AN compares to TNT, but there were reportedly 2700 tons of AN, some fraction of which exploded. In any case, it looks like the same order of magnitude, or at max one order, rather than 3 or 4. ETA: the linked USGS actually says 1.1 Kt, but that assumes all the AN participated.