Congresswoman Giffords is shot with 18 others (possible accomplice is sought)

TUCSON —Representative Gabrielle Giffords, an Arizona Democrat, and 18 others were shot Saturday morning when a gunman opened fire outside a supermarket where Ms. Giffords was meeting with constituents.

A 22-year-old suspect was in custody, law enforcement officials said. But at a Saturday evening news conference, investigators said they were looking for an accomplice who may have helped the gunman.

Six of the victims died. The Pima County sheriff, Clarence W. Dupnik, said among those killed were John M. Roll, the chief judge for the United States District Court for the District of Arizona, and a 9-year-old girl.

Ms. Giffords, 40, who the authorities said was the target of the attack, was said to be in very critical condition at the University Medical Center in Tucson, where she was operated on by a team of neurosurgeons. Dr. Peter Rhee, medical director of the hospital’s trauma and critical care unit, said that she had been shot once in the head, “through and through,” with the bullet going through her brain.

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