The FBI on Monday released a sketch of a person of interest in the pipe bomb explosion earlier this month at the East Chicago post office.
One postal employee was injured in the explosion shortly after 5:30 p.m. Sept. 6 at the post office, 901 E. Chicago Ave.
The person of interest was described as white, about 6 feet tall and about 30 years old with a thin build and clean-shaven face. He wore dark-rimmed glasses, black pants with very slender legs, dark vinyl sneakers and a faded black sweatshirt with the hood up.
The man had a unique walk, according to the FBI's Indianapolis Division.
The single pipe bomb did not damage the building, and there was no disruption in mail service. The postal worker suffered minor injuries.
When asked if the person of interest might be linked to other recent cases involving bombs, FBI spokeswoman Chris Bavender said she couldn't comment on ongoing investigations.
Anyone with information on the person of interest in the sketch is asked to call 800-CALL-FBI or submit a tip at tips.fbi.gov.