Employees at The Miami Herald were told to evacuate Friday after an armed man entered the newspaper's building.
Police set up a perimeter around the downtown building that houses the Herald and its Spanish-language publication El Nuevo Herald. It was not immediately known if there were injuries or hostages.
Katia Rodriguez, who works at the newspaper's city desk, said employees were being evacuated from the sixth floor. It was not clear whether employees from other floors were being evacuated.
Police did not immediately return calls seeking comment. The man was not immediately identified.
The Miami Herald reported on its Web site that the man walked into the sixth-floor newsroom, appeared agitated and demanded to see El Nuevo Herald Executive Editor Humberto Castello.
El Nuevo Herald is one of America's largest Spanish-language newspapers and is published by The Miami Herald Media Co.