Suspect in Orlando shooting spree charged with first-degree murder

* Gunman at large after firefighters and police responded to a reported shooting
* CNN affiliate WESH reports that at least eight people were shot
* Authorities receive report shortly before noon of shooting on an upper floor of building
* Video shows people fleeing scene

Orlando, Florida (CNN) — A gunman was at large after firefighters and police responded to a reported shooting Friday at a high-rise building in Orlando, Florida, authorities said.

Authorities received a report shortly before noon of a shooting on an upper floor of the high rise, said John Tormos of the Orlando Fire Department.

A spokesman for the Orange County Sheriff’s Office, which is helping the city police department, said investigators are looking for a man wearing a blue Polo shirt, gray vest and blue jeans.

"We’re in a search mode for the gunman," said Jim Solomons, a spokesman for the sheriff’s office.

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CNN affiliate WESH reported that at least eight people were shot at the Gateway Center — a 16-story building near Lake Ivanhoe and Interstate 4.

The interstate was closed in both directions near the office building, according to the Florida Department of Transportation Web site.