[Answer] Which substance did officials say likely caused the immense explosion that rocked Beirut on Tuesday?

Step 1 : Introduction to the question "Which substance did officials say likely caused the immense explosion that rocked Beirut on Tuesday? "

...1. Ammonium nitrate
2. Natural gas\
3. Semtex
4. TNT

Step 2 : Answer to the question "Which substance did officials say likely caused the immense explosion that rocked Beirut on Tuesday? "

Ammonium nitrate:

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The huge explosion in the Lebanese capital killed at least 135 people, injured more than 5,000, and displaced more than 250,000 people from their homes. \\The exact cause is still undetermined, but there were two explosions — a smaller one, and, seconds later, a larger blast that destroyed huge areas of the city. Officials said the second, more devastating explosion most likely came from a nearby 2,750-ton stockpile of ammonium nitrate, a highly explosive chemical often used as a fertilizer. \\Here is what we known about the Beirut explosion and photos that show the devastation. \\One of our international correspondents was bloodied in the Beirut explosion. Read her \first-person account.\

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