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Even if you only include intentional explosions, the British had 22,000 pound Grand Slam bombs in WW II, altho I don't know how much of that was explosive. There were also other explosions -- The British and Canadians blew up a ship in a German occupied harbor in France, St. Nazaire? Ammo ships and fuel tankers were intentionally targeted and had thousands of tons of explosive go off. Heck, even the Arizona explosion at Pearl Harbor was a magazine explosion and certainly had more than 6 tons of explosives go off.
Naw, I think Patrick has finally made a mistake :-)