ORLANDO, Fla. (AP) -- Authorities in Orlando, Fla. say a gunman opened fire today in the offices of an engineering firm where he was let go more than two years ago.

At least six people were hurt. Police are searching for a suspect in a sport utility vehicle.

People streamed out of the 16-story Legion Place office building around lunchtime. Some told local TV stations they had barricaded themselves inside their offices.

The Orlando Fire Department district chief says an unknown number of people are still in the building and could be injured. He says the SWAT team is trying to pull people out.

An Orlando police spokeswoman identified the suspect as Jason Rodriguez, and said he might be in a 2002 silver Nissan SUV with license plate D119UX.

A spokesman for Reynolds Smith & Hill, a transportation engineering consulting firm in the building, says Rodriguez was released in June 2007 for performance issues.