Rep. Gabrielle Giffords and six others died after a gunman opened fire at a public event on Saturday, the Pima County, Ariz., sheriff's office confirms. The 40-year-old Democrat, who was re-elected to her third term in November, was hosting a "Congress on Your Corner" event at a Safeway in northwest Tucson when a gunman ran up and started shooting, according to Peter Michaels, news director of Arizona Public Media. At least three other people, including members of her staff, were injured. Giffords was transported to University Medical Center in Tucson. Her condition was not immediately known. Giffords was talking to a couple when the suspect ran up and fired indiscriminately from about four feet away, Michaels said. The suspect ran off and was tackled by a bystander. He was taken into custody. Witnesses described him as in his late teens or early 20s.