Fire crews battled a second alarm fire in a pallet yard near 35th Avenue and Broadway Road.
The main fire was knocked down but crews were putting out hot spots Thursday night.
No one was injured in the fire. Firefighters worked in temperatures near 109 degrees.
The cause of the fire is under investigation.
Thirty-fifth Avenue was closed between Buckeye Road and Broadway Road as crews worked to fight the fire.
According to Phoenix Fire, more than 100 firefighters from multiple jurisdictions responded to the second alarm pallet yard fire, which included dangerous hazardous materials.
Crews protected a 10,000 gallon drum of diesel fuel while simultaneously working to contain the pallet fire.