Security guard fatally shoots gunman who killed woman on Citibank campus near Tampa

A gunman was killed in a shootout with a security guard after fatally shooting a woman at a Citibank office complex outside Tampa on Wednesday.

Police in Florida rushed to the scene just after noon following multiple reports of gunshots at the sprawling business complex.

An armed Citibank security guard jumped into action and confronted the gunman in the cafeteria. The guard fatally wounded the suspect, who died at the hospital, the Hillsborough County Sheriff's Office said.

Before shooting the woman, the gunman drove over several medians and crashed into an outdoor seating area where workers were having lunch.

"All of a sudden, I heard people come, people screaming,” a witness told local CBS affiliate WTSP. “Heard some people running around, and then I saw a big group of people, panicked faces, and then I heard three shots.”

Haunting video showed the gunman walking through the courtyard with a rifle before opening fire.

"There was no hesitation by anyone in this agency or the federal agencies to respond and engage with that suspect," Chief Deputy Frank Losat said. "Kudos to that security guard."

There were 3,200 Citibank employees on campus at the time of the shooting. TV footage showed long lines of employees streaming out of office buildings as officers swarmed the campus.

More than 365 deputies responded to the complex in suburban Tampa which includes four three-story office buildings.

Doug Merritt told The Associated Press that his son called him from the Citibank campus saying he fled after hearing gunshots.

“He was very close to it,” Merritt said. “He left all this stuff where he was at and he was able to get out of there.”

Merritt didn’t know whether his son was safe for around an hour as he struggled to get in touch over a bad internet connection.

“I wanted him to get to safety," he said. “I was upset.”

Citigroup said in a statement that it was “aware of an incident” at the complex and was cooperating with police.