Authorities have identified the teenager who shot and killed eight Fed-Ex employees in Indianapolis and wounded several others.
Police say Brandon Scott Hole, 19, shot four people outside the FedEx facility near the Indianapolis airport on Thursday night.
The former Fed-ex employee then entered the facility and killed four others before turning the gun on himself.
Five people were hospitalized with bullet wounds. One is in critical condition, police say.
The FBI identified Hole and released a recent mugshot of him to the news media.
Hole's mother had warned police that he planned to commit "suicide by cop," the FBI said.
Hole was questioned last year and police seized a weapon from him after his mother warned authorities that he might try "suicide by cop."
CNN reporter Ana Cabrera tweeted, "The suspect in the Indianapolis mass shooting was known to federal and local authorities prior to the attack."
Federal agents served a search warrant on Hole's home, and seized evidence including computers and electronic devices early Friday.