MILWAUKIE, Ore. -- A hazardous materials cloud from Precision Castparts on Johnson Creek Boulevard Wednesday sent four people to the hospital and prompted what was supposed to be an order for residents within a half-mile to stay in their homes.

Thursday at 5 a.m., emergency officials declared an 'all clear' and workers were returning to the plant that makes precious metals, though the affected building remain closed.

Whitman Elementary School was closed Thursday and Johnson Creek Boulevard remained closed between 45th and 55th.

A reverse 9-1-1 call to neighbors did not go through, fire officials said.

A hydroflouric nitric acid combo cloud leaked from the building just before 6 p.m. when a chunk of titanium in a vat of acid inside the building created a chemical reaction after an electrical failure.

Two Clackamas Co. Fire &Rescue firefighters and two employees of the company suffered respiratory irritation and were taken to the hospital for treatment.

Sally Lucero said she can see Precision Castparts from her home, but she didn't receive a warning from authorities.

We're too close for them not to have acknowledged it, said Lucero.

Nearby Reed College was aware of the situation, but because the campus was located outside of the warning zone, staff didn't recommend that anyone seek shelter.

Precision Castparts is a Fortune 500 company, and according to its website is a worldwide, diversified manufacturer of complex metal components and products.

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