WEST, Texas - Federal and state officials say they're poised to announce findings of their investigation into a deadly Texas fertilizer plant explosion that killed at least 14 people.

Officials from the Texas State Fire Marshal's Office and the federal Bureau of Alcohol, Tobacco, Firearms and Explosives are scheduled to release results of a monthlong investigation Thursday afternoon. The fire marshal's office and ATF are leading the probe into what sparked a fire at West Fertilizer and what caused ammonium nitrate to explode.