ORLANDO, Fla. – Officials said at least eight people were hurt in a shooting at a downtown office building Friday and a gunman was on the loose.

People streamed out of the high-rise building around lunchtime and some told local television stations they had barricaded themselves inside their offices.

Orlando Fire Department District Chief Michael Droege said an unknown number of people were still in the building and could be injured. He said the SWAT team was still trying to pull people out.

"The building is not secure now," he said. "It's still unfolding."

Orlando police were searching for an armed man wearing a light blue polo shirt and jeans, said Orange County Sheriff's Spokesman Jim Solomons, whose department was called in for backup.

Gerry Gilgo, who works on the floor where the shooting occurred, told The Associated Press she was meeting a co-worker at the elevators for lunch.

"She yelled there are gun shots! There are gun shots! Get back in your office," Gilgo said.

Orlando Police Sgt. Barbara Jones confirmed there had been a shooting and multiple people were hurt but she couldn't say how many. She said there is believed to be only one shooter.

The Orlando Fire Department told WESH-TV that at least eight people were injured. Interstate 4 was closed in both directions through downtown and a nearby school was locked down.

Rows of ambulances lined up outside the building as police snipers took up positions around the building and officers on foot and horseback searched the area.