Information is still coming in, but at this point, this has been confirmed:
U.S. Rep. Gabrielle Giffords of Arizona was shot outside a grocery store in Tucson while holding a public event, Arizona Public Media reported Saturday.
Giffords, who was re-elected to her third term in November, was hosting her first "Congress on Your Corner" event at the Safeway in northwest Tucson when a gunman ran up and started shooting, according to Peter Michaels, news director of Arizona Public Media.
Update: Witnesses on CNN are reporting that there were 15-20 shots fired, that there are at least two bodies on the street, and that Rep. Giffords was "shot point-blank range" in the head.