ATLANTA — A domestic dispute erupted in gunfire in CNN's headquarters complex Tuesday, killing one person and critically wounding another, authorities said.

A man and a woman were involved in an argument near the main entrance of the complex when the man pulled a gun and shot her, Atlanta Police Officer James Polite said. He said the armed man was then shot by a CNN security guard.

One of the people transported to Grady Hospital was pronounced dead on arrival, hospital spokeswoman Denise Simpson said. It was not immediately clear which person died. Simpson said the other was in critical condition.

A man and a woman were seen being carried out of the building on stretchers. The man's face was covered in blood and his shirt was removed.

CNN reported that the offices of its Internet operations, CNN.com, were immediately evacuated. Video footage also showed police pointing guns at a man lying on the ground inside the building.

An announcement over the building's public-address system said there had been gunfire "with potential casualties by the escalators" near the main entrance of the building, facing Centennial Olympic Park.

"I heard four or five shots. I really didn't see it. I got out of there quick," said Jas Stanford, 27, who had been helping take down a temporary stage in the park used for college basketball's Final Four festivities.

The CNN complex also includes the Omni Hotel, a large atrium and a food court. It is connected to Philips Arena, the home of the NBA's Atlanta Hawks.

In the food court, Trina Johnson, 44, of Atlanta, was with her daughter on a family outing.

"All of a sudden we heard a big boom. We thought it was an explosion," Johnson said. "We didn't see the gun. Everybody just started running."