(Originally posted at 10:34 but moved up.)

Jesus.

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.

The Democrat, 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.

At least five other people were injured, and the gunman was reportedly tackled by a bystander and is in custody.

UPDATE: Giffords was one of the crosshairs in Sarah Palin's infamous map of targeted politicians.

UPDATE: NPR is reporting that Giffords and six others were killed by the gunman, and that nine others were injured.

UPDATE: According to the Huffington Post, a hospital spokeswoman told MSNBC that Giffords is still alive, and is currently in surgery.

UPDATE: Daily Kos is reporting that Giffords's Republican opponent in the last election had a "Get on Target for Victory" fundraising party at a shooting range. Also, people on Twitter are reporting that Sarah Palin's website has just been scrubbed of all mentions of Giffords. The "Take Back the 20" website that featured the map is down. Slog commenter Mdurango points out that Sarah Palin's target map on the Take Back the 20 site is still, intermittently, up, and still features Giffords. Sorry, folks: I'm trying to separate the bullshit from the real, but it's all flying hot and heavy today.

UPDATE 12:13 pm: Aaaand it just occurred to me to start time-stamping these. Huffington Post says that a federal judge may have been shot at the scene, too. When asked if his daughter had any enemies, Giffords's father replied, "The whole tea party." In addition, we have comments from Sarah Palin:

My sincere condolences are offered to the family of Rep. Gabrielle Giffords and the other victims of today's tragic shooting in Arizona.
On behalf of Todd and my family, we all pray for the victims and their families, and for peace and justice.

And President Obama:

This morning, in an unspeakable tragedy, a number of Americans were shot in Tuscon, Arizona, at a constituent meeting with Congresswoman Gabrielle Giffords. And while we are continuing to receive information, we know that some have passed away, and that Representative Giffords is gravely wounded.
We do not yet have all the answers. What we do know is that such a senseless and terrible act of violence has no place in a free society. I ask all Americans to join me and Michelle in keeping Representative Giffords, the victims of this tragedy, and their families in our prayers.

UPDATE: 12:47 pm: Here's the New York Times report:

Dr. Steven Rayle, a former emergency room doctor who now works in a hospice, said that he had witnessed the shootings. He said the congresswoman was standing behind a table outside the Safeway greeting passersby when the gunman approached her from behind, held a gun about a foot from her head and began firing.

“He must have got off 20 rounds,” he said. Ms. Giffords slumped to the ground and staff members immediately rushed to her aid, Dr. Rayle said.

Dr. Rayle said he performed CPR on some of the victims. He said one of the victims was a young child and appeared to be in critical condition with a gunshot wound.

He said that one of the staffers tackled the gunman and that he and others helped detain the suspect. The doctor described the gunman as a white male in his mid-20s with short hair and “dressed in a shabby manner.”

There's a press conference streaming live right here in audio and right here in video.

12:56: The gunman has been identified as "Jared Laughner of Arizona, born September 1988." UPDATE: It's spelled "Loughner".

1:02: Keith Olbermann is reporting on Twitter that "Rep. Giffords is out of surgery and alive." Huffington Post and others are saying doctors are "optimistic," but she is still in critical condition. The judge who was injured was identified as John Roll.