Hayven Danielson was one of three killed, along with her younger sister and her father, at Horizon Biofuels in Fremont, Nebraska, last year.

YAZOO CITY, Miss. (AP) — An explosion at a hydrogen and nitrogen product manufacturer in Mississippi on Wednesday caused an ammonia leak and forced nearby residents to evacuate, officials said.

A North Texas man and his family fear the worst after an explosion destroyed the chemical plant where he worked Thursday morning. Dylan Mitchell, 27, is believed to have been inside the Tri-Chem ...