Police are searching for a gunman who injured at least eight people at a downtown Orlando, Fla., office building.

People are streaming out of the building and some say they have barricaded themselves inside their offices.

Orange County Sheriff's Spokesman Jim Solomons says his department is backing up Orlando police and they're still looking for an armed man wearing a light blue polo shirt and jeans.

Orlando Police Sgt. Barbara Jones confirms there has been a shooting at a high-rise and multiple people have been hurt but she can't say how many. She says there is only one shooter.

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