A gunman killed a police officer Friday near the headquarters of the Centers for Disease Control in the US city of Atlanta before being found dead at the scene, authorities said.

No other people were killed or physically wounded in the shooting, during which multiple rounds were fired in the CDC campus, police said.

"Officers arrived -- found a critically injured DeKalb County police officer that was down," Atlanta Police Chief Darin Schierbaum said at a press conference.

The police officer was later identified as 33-year-old David Rose of the DeKalb County Police Department. He left behind a pregnant wife and two children, the department said in a statement.

The shooter's identity has not been released.

Schierbaum said it was too early in the investigation to comment on reports by

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