UPDATE: The shooter has been identified as Jared Lee Loughner. Much more info on him here.

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Jared Laughner, the person reportedly being held under suspicion of shooting Congresswoman Gabrielle Giffords (D-Ariz.), was described by eyewitnesses as a young white man who looked like a "fringe character."

Laughner apparently shot Giffords and 12 others at a public event at a Safeway grocery store in Tucscon. He reportedly shot the congresswoman "point blank" in the head and may have come from inside the store. After shooting Giffords, he allegedly fired 20-30 rounds and hit "a number of people," including a child. He attempted to flee after running out of ammunition and was tackled by one of Giffords' staffers.

Eyewitnesses have described Laughner as "young, mid-to-late 20s, white, clean-shaven with short hair and wearing dark clothing."

He was arrested upon arrival of the sheriff's department.

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