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(CNN) -- U.S. Rep. Gabrielle Giffords was critically wounded Saturday in a shooting at a Tucson, Arizona, grocery store in which at least 11 other people were injured, officials said.
Darci Slaten, a spokeswoman for University Medical Center in Tucson, said Giffords was undergoing surgery Saturday afternoon for a gunshot wound to the head.
A federal judge from Arizona was among the 11 others shot in the incident, a law enforcement source told CNN.
The shooting happened shortly after 10 a.m. MST, Pima County Sheriff's Department spokesman Jason Ogan said.
Giffords, 40, was holding a constituent meeting at the Safeway grocery store when the shooting occurred, according to a schedule posted on her website.