Several shot at Tuscon grocery

(CNN) -- Several people were shot Saturday at a grocery store in Tucson, Arizona, a spokesman for the Pima County Sheriff's Department said.

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

A couple of victims with gunshot wounds have arrived 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 the motive for the shooting is unclear.

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