Indianapolis police say eight people have been shot dead at a FedEx parcel delivery facility near the city's airport and the suspected gunman has killed himself.
At least four people were hospitalised, including one person with critical injuries, police spokesperson Genae Cook said at an early morning news conference on Friday.
Two others were treated at the scene and released. No law enforcement officers were injured.
When police arrived, officers observed an active shooting scene at the facility, Indianapolis police spokesperson Genae Cook told reporters early on Friday.
Ms Cook added that the gunman had died and the public was not believed to be in immediate danger.
FedEx released a statement early on Friday saying it was cooperating with authorities and working to get more information.
"We are aware of the tragic shooting at our FedEx Ground facility near the Indianapolis airport. Safety is our top priority, and our thoughts are with all those who are affected," the statement said.
A witness who said he works at the facility told WISH-TV that he saw a man with a gun after hearing several gunshots.
"I saw a man with a submachine gun of some sort, an automatic rifle, and he was firing in the open," Jeremiah Miller said.
Another man told WTTV that his niece was sitting in her car in the driver's seat when the gunfire erupted, and she was wounded.
"She got shot on her left arm," said Parminder Singh. "She's fine, she's in the hospital now."
He said his niece did not know the shooter.
Family members gathered at a local hotel to await word on loved ones. Some said employees aren't allowed to have their phones with them while working shifts at the facility, making it difficult to contact them, WTHR-TV reported.
