A man who had been fired in April from his job at a Florida company opened fire Monday at the Orlando-area business, killing five people before taking his own life, authorities said.
Four people were killed at the scene, while a fifth died at the hospital, Orange County Sheriff Jerry Demings told reporters.
Demings said the incident was being treated as a "workplace violence incident" and did not appear to have any links to terror.
The shooting occurred in an industrial area with multiple warehouses on Forsyth Road and Hanging Moss Road, the sheriff's office said.
A television station interviewed a woman who said her sister was in a washroom when she "heard a bang" in her workplace. She emerged and saw someone on the floor.
"My boss is dead," the employee told her sister in a cellphone call.
The woman told reporters her sister was not shot but was receiving medical attention due to the shock of what she witnessed. Neither woman was identified.
The shooting took place almost a year after 49 people were killed on June 12, 2016, at the Pulse nightclub in Orlando, the deadliest mass shooting in modern US history. At least 58 people were also injured.
“Over the past year, the Orlando community has been challenged like never before," Florida Governor Rick Scott said in a statement. "I ask all Floridians to pray for the families impacted by this senseless act of violence."