Four others who were shot and another who was injured were taken to hospitals, officials said, adding that some may have been privately transported to medical facilities.
No law enforcement officers were hurt in the shooting carried out by a former employee who last worked at the facility in the fall, authorities said Friday afternoon.
A motive for the attack wasn't immediately clear, but a year ago, the shooter's mother said she feared he might be suicidal.
"In March 2020, the suspect's mother contacted law enforcement to report he might try to" attempt "suicide by cop," said FBI Special Agent in Charge Paul Keenan, who runs the bureau's Indianapolis field office.
The phrase "suicide by cop" refers to a self-destructive person who intentionally draws the attention of police in hopes of a deadly confrontation.
"A shotgun was seized at his residence. Based on items observed in the suspect's bedroom at that time, he was interviewed by the FBI in April 2020. No Racially Motivated Violent Extremism ideology was identified during the course of the assessment and no criminal violation was found," the statement said. "The shotgun was not returned to the suspect."
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