As Americans paused in reaction to yesterday’s fertilizer factory explosion in West, Texas, many are remembering the 1947 fertilizer explosion that killed more than 500 people.

The explosion was caused by a fire that broke out on the SS Grandcamp, igniting the ship's cargo of fertilizer.

“A chain of explosions set off by the blowing up of a nitrate-laden ship smote this Gulf port yesterday, killing hundreds and injuring thousands,” reported the Associated Press at the time. “It was the worst American disaster in ten years."

Watch a video of that explosion above.