A man who was wounded today during a shooting at the building complex that houses CNN's headquarters is transported by an emergency worker in Atlanta. 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 the woman, and then the armed man was shot by a CNN security guard responding to the scene, Atlanta Police Officer James Polite said. Ron Williams | Associated Press

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, police officer James Polite said. He said the armed man was then shot by a CNN security guard.

One of the people was pronounced dead on arrival at a hospital, spokeswoman Denise Simpson said. CNN.com reported that the victim was identified as Clara Riddles, 22, of College Park, who was an employee of the Omni Hotel at the CNN Center complex, according to an investigator with the Fulton County Medical Examiners Office.

Riddles, who witnesses said appeared to be pregnant, was shot and the gunman was then shot by Capt. Odell Adams, who joined Turner Security in 1996, according to a Turner spokesperson.

CNN.com also reported that preliminary reports indicate the man was shot in the face, a law enforcement source said on condition of anonymity because the investigation is ongoing.

The man and Riddles were taken to Atlanta's Grady Memorial Hospital today. The shooter was undergoing surgery and was in "severely critical condition," the hospital said.

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

Police said the man and woman had a prior relationship.

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.

Former Advertiser news editor Brad Lendon, who is now a writer for CNN.com, said he heard a loud bang, and then saw a woman on the ground next to a potted plant near a back entrance to the CNN.com newsroom. A man stood over her "and fired at least two shots into her," he was quoted as saying on CNN.com.

After the shots, Lendon said, the gunman "looked around, his head turning in my direction. I don't know if he saw me, but at that moment the gravity of what I'd witnessed hit me. I turned away and tried to find the safest way I could out."

An announcement over the building's public-address system said there had been gunfire "with potential casualties." Police cordoned off an area by the escalators near the main entrance, facing Centennial Olympic Park. The park is where a bomb killed a woman during the 1996 Summer Olympics and injured more than 100 people.

"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."