From kpho.com:

GILA BEND, AZ (KPHO/KTVK) –
Two people were shot and killed and two others wounded in a mountain gun battle Monday between two groups of people, likely drug smugglers, a Maricopa County Sheriff’s Office spokesman said.

The shootout happened about six miles east of Gila Bend in an area that is considered a high-traffic corridor for human and drug smuggling.

http://www.kpho.com/story/28912720/mcso-2-dead-2-wounded-in-mountain-gun-battle#ixzz3YZijEx7f