BUCKEYE, Ariz. (AP) — Authorities are investigating the deaths of three people whose bodies were found Wednesday after an early-morning structure fire at an unincorporated community near Buckeye.

Maricopa County Sheriff’s officials said the fire broke out around 4:30 a.m. in Arlington, which is 12 miles (19 kilometers) southwest of Buckeye.

News helicopters showed footage of a structure smoldering, with half of it burned down.

Sheriff’s officials didn’t immediately release any information about the victims’ identities or a possible cause of the fire.

Arizona Fire & Medical Authority crews and fire units from Buckeye and Avondale responded to the scene.

They reported finding a fully involved fire in a converted small residence in the backyard of a home.

After firefighters extinguished the flames at the detached structure, they found the three bodies.

Arlington is 43 miles (69 kilometers) west of Phoenix and had a population of about 150 as of 2020.