(CNN) — Two bodies died and addition 19 were afflicted at a central Arizona resort afterwards spending up to two hours in a “sweatbox,” authorities said Friday.

Two bodies died and were 19 afflicted afterwards spending up to two hours central this “sweatbox” at an Arizona resort.

About 50 bodies had spent up to two hours central the “sweatbox,” a dome-like structure covered with tarps and blankets, according to the Yavapai County Sheriff’s Office. Hot rocks and baptize are used to actualize steam in the enclosed environment.

Fire and accomplishment admiral received an emergency call Thursday night from the Angel Valley Resort near Sedona and transported the afflicted by air and land ambulances to adjacent medical facilities, the sheriff’s appointment said in a release. Two of the afflicted were arresting dead shortly afterwards accession at the Verde Valley Medical Center.

At least one patient remained in critical condition Friday at the Verde Valley Medical Center, the sheriff’s appointment said.

The two fatalities had not been publicly articular Friday afternoon added than as “a middle-aged man and woman.”

The sheriff’s Criminal Investigations Section began a death investigation Thursday night.

A sheriff’s spokesman did not anon acknowledgment phone calls larboard by CNN.

Angel Valley Resort advertises itself as “a place to relax and heal … where powerful earth energies are present and active.”

It’s Web armpit says the resort is on 70 secluded valley acreage 20 account from Sedona. The resort says it is surrounded by thousands of acreage of civic forest.