ATLANTA (AP) _ A gunman shot one man to death and critically injured two others at Atlanta's main downtown subway station just before afternoon rush hour Tuesday, authorities said.

Minutes after the shooting, police arrested Alvin James King, 34, of Atlanta. He was charged Tuesday night with murder and two counts of aggravated assault, said police Sgt. Frank McClure.

King was being held without bond pending a court appearance Wednesday morning, police spokesman Glenda Lock said.

''From all we're getting, there was no discussion, no conversation. It was unprovoked,'' said Gene Wilson, chief of security for the Metropolitan Atlanta Rapid Transit Authority.

The shooting happened at the Five Points station, where the city's east- west and north-side rail lines converge. The men were shot as they walked across a plaza at street level outside the station.

The dead man was Keith Jonas of suburban Marietta, said John Hester, a spokesman at Grady Memorial Hospital. Jonas's age wasn't available. Jonas, who died at the scene, had been shot in the arm and chest, said Dr. Gail Anderson, the hospital's associate medical director.

The wounded men were Anthony Burns Lake, 37, of Chesterfield, Mo., and Bill Johnson, 41, of St. Louis, Hester said. Both were in critical condition, he said. Anderson said one of the survivors had been shot in the back of the head, and the other had been shot near his right eye.

Hundreds of shoppers and commuters moved through the station, paying no attention to the crime scene, which was marked off with yellow tape.