This story is being updated as more information becomes available.
Police are calling the shooting at a Bedford Park, Illinois FedEx shipping facility Thursday morning are a "domestic issue" and say that the gunman, Benyamin Robinson, 28, was shouting his wife's name while firing shots inside the building where she was working.
Police told the Chicago Tribune that Robinson and his wife have had "recent problems." Robinson entered the FedEx World Service center, 5151 W. 73rd St., around 7:50 a.m. and started firing shots from inside a delivery vehicle. His wife hid in her office and was not injured, nor were any of the couple's three children.
Michael Shannon, 25, a driver with the company for about a year, was loading his truck when he heard two shots fired and ducked inside the vehicle, he told the Tribune. A man followed him into his truck with a handgun and demanded keys to the truck and told Shannon to leave.
"My life was in his hands," Shannon told the Tribune. "I really thought he was going to shoot me. It was the most terrible moment in my life."
No one was injured, according to early reports from Fox Chicago. The SWAT team reportedly found the man's body when they entered the building.
The Tribune has more from shaken up employees:
"He came in wielding a gun," said an employee at a firm that shares a parking lot and where several FedEx employees took refuge. "He got into a vehicle and started firing. People were trying to hide under other vehicles, they were running outside, they were taking cover.
"He just kept firing. They just said it was crazy," the employee said. "We locked our doors and stayed away from the windows."
An armored truck, a police SWAT van and several squad cars and fire trucks responded to the scene, according to NBC Chicago. A news chopper observed a police team entering the building around 9:15 a.m.
Nearby high school St. Laurence is on lockdown as a precaution. Bedford Park is about 15 miles southwest of Chicago.