"Prime Minister Hassan Diab said that 2,750 metric tons of ammonium nitrate had been stored for six years at a warehouse in the port of Beirut without safety measures.

The head of Lebanon's customs authority said he had sent six memos to the country's judiciary warning that substances being stored in the port were dangerous to the public."

That's 6.06 million pounds in a leaky warehouse. It becomes more reactive when between 5 and 10 percent water is present (not stronger - just more likely to degrade catastrophically).