Congresswoman among 12 shot at AZ grocery store
At least 12 people were shot at a Tuscon grocery store on Saturday, and U.S. Rep. Gabrielle Giffords was among them, a Democratic party source told CNN.

Giffords was holding a constituent meeting at the grocery store when the shooting occurred, according to a schedule posted on her website.

Neither Giffords' condition nor that of any of the other wounded was immediately available. The Democratic source described the situation as "pretty serious."

The shooting occurred at a Safeway shortly after 10 a.m. MST, according to sheriff's spokesman Deputy Jason Ogan.

Pictures from the scene showed a Giffords banner hanging from the storefront.

At least two victims with gunshot wounds were transported at Northwest Medical Center, according to spokesman Richard Parker.

"They've been coming in the last 10 minutes. I'm not sure of the severity of their injuries," he said.

Ogan said he did not have conditions on any of the wounded and said the motive for the shooting is unclear.

"We're just trying to sort this out right now," he said.

An employee of a nearby business, Jason Pekau, told CNN that he heard "15 to 20 gunshots."

Giffords, a Democrat, was first elected in 2006. She has served as chairwoman of the House Space and Aeronautics Subcommittee and also holds seats on the House Science and Technology and Armed Services committees.