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EAST CHICAGO -- An explosion occurred a post office in East Chicago, Indiana.

There was one detonation of a suspected pipe bomb inside the postal office, said East Chicago acting fire chief, Francisco Mendez.

#BREAKING - 1 hurt after explosion at East Chicago, Ind. post office: ATF pic.twitter.com/gDcq257Any — Sam Unger (@SamUngerWGN) September 7, 2017

Two people were inside the building at the time of the detonation while one person was outside.

One person, an employee of the postal office, was injured. The victim suffered minor injuries.

Officials are investigating the explosion at this time.

This is a developing story. Check back for updates.

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