CRETE, Neb. (AP) — A man shot and wounded three people at a cold-storage facility where he worked before apparently shooting and killing himself, authorities said.

Saline County Sheriff Alan Moore told the Lincoln Star Journal that about 35 people were at the Americold Logistics facility when the gunman opened fire at about 10 p.m. Wednesday. The gunman, whose identity hasn't been publicly released, worked at the plant, Moore said.

Moore said about 50 officers responded to reports of the shooting, unsure of whether the shooter was still a threat.

"When we first came across him, it appeared that it was a self-inflicted wound that ended it," the sheriff said, referring to the gunman.

Two of the wounded were taken to a Lincoln hospital. The other was treated at the Crete Area Medical Center, in Crete. Their names and conditions weren't available. It was unclear whether they also worked for Americold.

The sheriff didn't immediately return a call Thursday morning from The Associated Press.

The Americold facility is a couple of miles south of Crete and next to a Farmland Foods plant. Both were locked down immediately after the shooting, although authorities don't believe the gunman ventured onto Farmland property.

By early Thursday morning, Farmland had reopened and Americold workers were allowed to leave.

A worker who answered a phone at the Farmland plant later Thursday morning declined to comment.

Spent shells were found outside the Americold building, inside in a cafeteria and other areas, Moore said.

Americold also has facilities in Fremont and Grand Island, Neb. The company's website describes it as the largest temperature-controlled food storage network in the U.S., with about 100 facilities nationwide.

A company spokesman did not immediately return a call from The Associated Press.

Copyright 2010 The Associated Press.

THIS IS A BREAKING NEWS UPDATE. Read earlier story below.

CRETE, Neb. (AP) — Authorities in eastern Nebraska say a gunman opened fire at a cold storage facility outside Crete, injuring three people before apparently turning the gun on himself.

Saline County Sheriff Alan Moore says about 35 people were at the Americold Logistics facility when the shooting began around 10 p.m. Wednesday. Moore says the gunman, who hasn't been identified, was an employee there.

Authorities arrived on the scene to find the gunman dead outside. Moore told the Journal Star of Lincoln that it appeared he died of a self-inflicted wound.

The three who were wounded were taken to area hospitals.

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Information from: Lincoln Journal Star 

Copyright 2010 The Associated Press.