One woman was killed and four others were injured in Wednesday's shooting.
A gunman killed one and wounded four others in a mass shooting in an Atlanta medical center waiting room on Wednesday, police said.
The suspect, identified as 24-year-old Deion Patterson, was apprehended following an hourslong manhunt, police said Wednesday night.
Dr. Timothy Simons was performing surgery one floor above the scene where the shooting unfolded.
He told ABC News he completed the surgery and then sheltered in place.
When police came to clear the building floor by floor, Simons said he was told to put his hands up to verify that he was not the shooter.
"Then they escorted us all down the stairs," he said.
-ABC News' Janice McDonald
As Atlanta police search for the suspected gunman, 24-year-old Deion Patterson, they say a car was stolen "not long after the shooting" and has since been recovered.
"We are working to locate the carjacked vehicle and to determine whether it is connected to the shooting," police said.
Dr. Ahmed Ali, a radiation oncologist at the building, told ABC Atlanta affiliate WSB that he was returning from his lunch break when he saw armed officers swam the scene.
"I was worried what was happening," he said. "Building security … they told me gunshots were coming from the 11th floor. They said there was a pool of blood in the elevator shafts when the doors opened."
-ABC News' Ivan Pereira
Of the four people who were shot and injured, three are in critical condition and one is in the emergency department, according to hospital officials.
All four are adults, officials said.
