The Corps of Engineers building in South Seattle was evacuated Friday morning.

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A “suspicious package” delivered on Friday to the U.S. Army Corps of Engineers’ (USACE) Seattle headquarters mail room turned out to be an envelope of brochures, Kristin Tinsely, a spokeswoman for the Seattle Fire Department said.

As a precaution, building 1202 was evacuated for around an hour, but has since reopened to normal operations. The fire department’s Hazardous Materials team investigated the package in the industrial district at the 4700 block of East Marginal Way South. The Seattle Police Department and FBI were also at the scene.

USACE was not immediately available to comment on why the package was initially deemed suspicious.

“We encourage anyone to call us if they are suspicious of any packages that are delivered to their home or business,” Seattle police spokesman Sgt. Sean Whitcomb said Friday. “There was something about it that caused them concern, but it turned out to be not concerning at all.”