Employees at Citibank’s corporate campus in Brandon, Fla., just outside Tampa, were eating lunch outdoors on Wednesday when a car tore across the property, drove over several medians and a grassy area, and smashed through a secure, fenced-in section of the building before crashing into the outdoor seating area.

The driver stepped out of the wreck carrying an AR-15-style rifle. Within moments, a woman who worked for a vendor at the site had been shot. She was pronounced dead at the scene.

“Upon the car coming to rest, the suspect exits the vehicle with a rifle, approaches the female, and she is shot,” Chief Deputy Frank Losatt of the Hillsborough County Sheriff’s Office told reporters.

The gunman then made his way into the campus cafeteria, where he was confronted and shot by an armed Citibank security guard. He was taken to Tampa General Hospital, where he died. Four other people were wounded in the attack, all with injuries described as non-life-threatening, and are being treated at a local hospital.

Authorities believe the shooting, which unfolded at around noon, was a targeted attack, and that the gunman intended to kill as many of the more than 3,200 people on campus as possible before the guard intervened.

“This was a tragic situation where a victim was killed by an individual who was intent on killing as many people as possible,” said Hillsborough County Sheriff Chad Chronister. “Thanks to the brave actions by the security team on-site and more than 365 deputies, this unhinged suspect was stopped before he could harm anyone else.”

Bodycam footage released by the sheriff’s office shows deputies rushing through the campus toward the cafeteria and helping evacuate dozens of employees from the grounds.