MILWAUKIE, Ore. -- A reverse 9-1-1 call Wednesday to warn residents within a half-mile of Precision Castparts of an acidic cloud never actually happened, according to Clackamas Fire District spokesman Steve McAdoo.

The breakdown in communication between fire departments and dispatchers was still being analyzed Thursday, he said.

The 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.

Two firefighters and two employees were treated for injuries.

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