As many as 15 people are thought to be injured or trapped inside an Omaha plant that produces animal supplements.
Rescuers had taken five people to the hospital shortly after 10:30 a.m. Monday. They notified emergency room personnel that others remained inside International Nutrition near South 76th and F Streets.
Emergency dispatchers received a report of a possible industrial explosion Monday about 10 a.m.
At least five rescue squads were dispatched to 7706 I Plaza, home of International Nutrition.
Early reports indicated that up to 12 to 15 people were injured or trapped in the 10 a.m. blast, with at least five men taken to Creighton University Medical Center. Four were in serious condition and the fifth person was in critical condition.
Among the five men who were injured were a 21-year-old, a 36-year-old, a 37-year-old and a 49-year-old.
According to police radio dispatches, the 21-year-old suffered a head laceration and the 36-year-old inhaled limestone dust. Both are in serious condition.
International Nutrition manufactures farm animal supplements. According to its website, "International Nutrition has serviced the U.S. feed industry for over 40 years. Combining an inventory of over 350 critical ingredients with our expertise in producing medicated, nutritional and specialty premixes, we are successfully servicing the needs of animal health distributors and feed manufacturers."