SAN ANTONIO, Texas (Reuters) – Investigators have confirmed that ammonium nitrate was the trigger for the explosion at a West, Texas, fertilizer plant last month that left 14 people dead and some 200 injured, according to the Texas state fire marshal's office.

The actual cause of the fire and subsequent blast at the West Fertilizer facility is still being determined, investigators said.

The fire marshal's office has been leading the investigation of the April 17 blast, along with the federal Alcohol, Tobacco, Firearms and Explosives agency (ATF).

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