A powerful explosion that ripped through Beirut on Tuesday and killed more than 130 people may be the latest example of the danger posed by a common fertilizer stored in communities throughout the U.S.

As investigators work to find the official cause of the blast, Lebanon President Michel Aoun said it was fueled by an estimated 2,750 metric tons of ammonium nitrate that was stored unsafely in a warehouse.

Read more at The Center for Public Integrity.