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Over 200 volunteers resumed scouring a suburban Phoenix neighborhood Thursday morning for a 10-year-old boy who vanished after climbing out of his bedroom window Sunday night.

The search in Buckeye for Jesse Wilson has been hampered by sweltering temperatures and had to be halted late Wednesday morning because of the extreme heat.

Jesse Wilson, 10, was last seen in his room in Buckeye, Arizona, on the night of July 17, 2016, before disappearing. Buckeye Police Departmen

The area is supposed to hit the triple digits by noon Thursday, when the formal search is expected to be suspended again.

The FBI was assisting in the investigation.

Volunteers are looking through fields and rough terrain as family and friends remain hopeful that the boy, a student at the Bradley Creemos Academy charter school, can be found.

“We're working on looking for any clues that would help us find Jesse Wilson," volunteer Marylu Lopez told NBC affiliate KPNX. "I’m a mom of five and I think that one more pair of eyes will always make a difference."

Jesse is described as African American, 4 feet tall and weighing 60 pounds. He was last seen in his room at 9:30 p.m. Sunday, police said, and was wearing a red shirt, shorts, black socks and black shoes.