Firefighters, HAZMAT crews and EMS officials were called to the main Post Office in downtown Indianapolis on Saturday.
Officials said just before 12:30 p.m., postal inspectors reported a suspicious package outside of the building in the 100 block of West South Street near the truck terminal.
Three postal workers came in contact with the package, and at least two of them said they felt sick, officials said.
All three workers were ordered to undergo decontamination, firefighters said.
Police have closed some of the streets surrounding the branch across from Lucas Oil Stadium.
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