events
September 21, 1921
A storage silo in Oppau, Germany, explodes, killing 500–600 people.
Oppau explosion
The Oppau explosion occurred on September 21, 1921, when approximately 4,500 tonnes of a mixture of ammonium sulfate and ammonium nitrate fertilizer stored in a tower silo exploded at a BASF plant in Oppau, now part of Ludwigshafen, Germany, killing 500–600 people and injuring about 2,000 more.
September 21
September 21 is the 264th day of the year in the Gregorian calendar; 101 days remain until the end of the year.