The gunman fled, but a 51-year-old suspect was arrested 170 miles away in Kansas City three hours after the shooting,
"The murder of Doctor George Tiller is an abhorrent act of violence, and his family is in our thoughts and prayers at this tragic moment. Federal law enforcement is coordinating with local law enforcement officials in Kansas on the investigation of this crime, and I have directed the United States Marshals Service to offer protection to other appropriate people and facilities around the nation. The Department of Justice will work to bring the perpetrator of this crime to justice. As a precautionary measure, we will also take appropriate steps to help prevent any related acts of violence from occurring."
Source: U.S. Department of Justice