Arizona postpones game after shooting

Arizona postponed its game against Stanford on Saturday after U.S. Rep. Gabrielle Giffords was shot in the head earlier in the day.

An assailant opened fire outside a grocery store in Tucson, Ariz., while Giffords met with constituents, killing six people, including a 9-year-old girl and a federal judge, and wounding several others.

"The university feels the game should be delayed with deep respect to the victims and families impacted by this tragedy," Arizona athletics director Greg Byrne said.

The game was rescheduled for Sunday at 2:30 p.m. ET. It will still be televised by Fox Sports Arizona and Comcast SportsNet Bay Area.

Arizona's normal game security forces for a game are involved with the shooting incident, Byrne said.

Giffords, 40, was among 13 victims wounded in the shooting, federal law enforcement sources said. University Medical Center said her outlook was "optimistic" and that she was responding to commands from doctors.

The 9-year-old was identified as Christina-Taylor Green. She is the granddaughter of former Major League Baseball player and manager Dallas Green.

Information from The Associated Press and ABC News was used in this report.