Authorities say a gunman opened fire in the offices of an engineering firm where he was let go more than two years ago, killing one person and injuring five others.

Police say suspect Jason Rodriguez surrendered about three hours later, after officers saw him through the window of his mother's home and asked him to come outside.

Outside the police station, a reporter asked Rodriguez why he did it. Rodriguez replied: "Because they left me to rot."

Orlando Police Chief Val Demings says everyone who was shot was in the offices of Reynolds Smith & Hills, on the eighth floor. The five survivors are reported in stable condition.

A company spokesman says Rodriguez was an entry-level engineer who was fired in June 2007 after working there for a year.

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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.

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

Police cars and emergency vehicles surrounded the area, video showed. It also showed people fleeing.