UPDATE:

(AP) — At least four of the 10 workers sent to hospitals after an explosion and partial collapse at an Omaha manufacturing plant have already been released.

Authorities say two employees were killed in the accident at the International Nutrition plant in south-central Omaha on Monday morning.

Bergan Mercy Medical Center says two of the three workers sent there were treated and released.

The Nebraska Medical Center says two workers sent there were treated for minor injuries and then released. The hospital also says it treated a firefighter and released him.

Authorities say seven other workers were treated at the scene.

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(AP) — Officials say at least 10 people have been hospitalized and others could be trapped after an explosion and partial building collapse at an Omaha animal feed processing plant.

Interim Omaha Fire Chief Bernie Kanger said he’s not sure how many workers could be trapped in the wreckage of the International Nutrition plant. The fire that followed the explosion around 10 a.m. Monday has been extinguished. Firefighters are gingerly searching the structure, fearing that more debris could rain down.

Kanger says one firefighter was among those injured. At least two of the injured were sent to a burn center in Lincoln.

Kanger declined to comment on possible fatalities. At the time of the blast there were 38 employees at work.