Worrisome cloud sparks plant evacuation, haz-mat called out

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TEMPE -- Hazardous-materials crews got an early start Tuesday when they were called out to a manufacturing plant to investigate a suspicious cloud.

Probably water vapor

It happened at about 1 a.m., at HEI Inc., near University Drive and Price Road.

The plant produces computer parts.

Employees were evacuated just to be on the safe side.

It turned out that the worrisome cloud was not a dangerous chemical.

The Temp Fire Department said it was probably just water vapor caused by a process in the plant.

All of the workers were later allowed back inside.