Two women were found dead in a state park in southern Nevada after a group of hikers noticed they had not returned from their hike, authorities said Sunday, where triple-digit temperatures have scorched the region.

Las Vegas Metropolitan Police Department officials said a group of hikers who had seen the women enter the hiking trails at Valley of Fire State Park Saturday morning became concerned when they noticed the pair was missing, KLAS-TV reported.

Although the group of hikers and the two women were not part of the same group, according to KLAS-TV, one member of the group called Nevada State Park Police to perform a welfare check shortly before 3 p.m. When authorities arrived, state police said one woman was found dead on the trail and the other woman was located in a canyon.

State police have not released further information on the incident, including the hikers’ identities or a possible cause of death. The investigation remains ongoing.

Valley of Fire State Park, about 46 miles northeast of downtown Las Vegas, has faced dangerous temperatures this month. The southern part of Nevada remains under an excessive heat warning and temperatures reached 114 degrees on Saturday.

The Clark County Coroner’s Office confirmed earlier this week that Las Vegas has seen at least 16 heat-related deaths but noted the number could be higher, KNTV reported.

Several heat-related deaths have also occurred among hikers amid an ongoing heat wave that has plagued western and southern states with “dangerous, long-lived, and record breaking” temperatures, according to the National Weather Service.