An altercation at the Firebirds Wood Fired Grill restaurant at the La Encantada Mall in north Tucson led to the shooting, KGUN reported. It took place at 7:30 p.m., sheriff spokesman Cody Gress said in a news conference.
The shooting was contained to the restaurant, CNN reported. The shooting was not random, and all 3 people knew each other, KVOA reported. One handgun was used. Deputies did not make any arrests, and they are not looking for any suspects, according to Gress.
"All three individuals were known to each other, but the specifics of the relationship are unknown," Gress said.
One handgun was used during the shooting, KGUN reported. It is unknown how many shots were fired during the shooting.