CNN: Authorities Friday apprehended a gunman who entered an Orlando building where he used to work and shot six people, killing one of them, the city's police chief said.

Five others were wounded in the shooting on the eighth floor of the Gateway Center, Orlando Police Chief Val Demings told reporters. She said one other person had "chest pains." Authorities at one point had said that seven people had been shot.

"The information we have is that the victims were all employees of one company," Mayor Buddy Dyer said at a news conference.

The suspect surrendered to authorities at his mother's house after officers looking through a window saw him there.

"He was arrested without incident," Demings said, adding the information she's received indicated that there was only one gunman.

Earlier, authorities identified the suspect as Jason Rodriguez, who formerly worked for Reynolds Smith and Hills, an architectural and engineering firm, in Gateway Center. A company spokesman said he had been let go two years ago for "performance issues."

Demings said authorities received a phone call around 11 a.m. ET about an active shooting at the 16-story office building.

Shortly afterward, officers arrived at the building, which lies beside Interstate 4 and Lake Ivanhoe on the northern edge of downtown, and began searching it floor by floor, she said.

Meanwhile, police cordoned off the area and a sheriff's department helicopter circled overhead.

During the search for the suspect, I-4 was closed in both directions, but it had reopened by midafternoon Friday, according to the Department of Transportation's Web site.

Mike Bernof, a spokesman for Reynolds Smith and Hills, said the company's office in Orlando primarily does transportation engineering work and that Rodriguez did engineering with the firm. He did not offer further details.

Bernof said that as far as he knew, all the people who were shot were with the firm.

Public records indicate that Rodriguez filed for Chapter 7 bankruptcy in May and that the case was discharged in September.

A woman who answered the telephone at Price Law Firm in Orlando confirmed that lawyer Charles Price represented Rodriguez in the bankruptcy filing but would not offer details.

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