The explosion, in the quiet town of fewer than 3,000, ripped through the night at around 8 p.m. local time, said Representative Bill Flores, a Republican who represents the district.
It began with a smaller fire at the plant, West Fertilizer, just off Interstate 35, about 20 miles north of Waco, Mr. Flores said, which was attended by local volunteer firefighters. “The fire spread and hit some of these tanks that contain chemicals to treat the fertilizer,” Mr. Flores said, “and there was an explosion which caused wide damage.”
Videos posted online showed a large fire, visible from hundreds of yards away, followed by a fireball that blasted high into the sky and, according to television footage, set fires burning into the night.