A gunman went to a town hall meeting at the Safeway supermarket in Tucson. Six people were killed and 12 others were wounded, including U.S. Rep. Gabrielle Giffords.
Early Sunday morning, investigators released a surveillance camera photo of a man who was seen at the location where the shooting occurred.
Pima County Sheriff Clarence Dupnik told reporters Saturday that authorities were searching for a second individual who was a "person of interest" in the investigation.
He is described as a white male, approximately 40 to 50 years old. He has dark hair and was last seen wearing blue jeans and a dark blue jacket.
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