Three hikers died from apparent heat-related illnesses in the Grand Canyon on two separate days in the past week in the inner canyon, where temperatures can exceed 109 degrees Fahrenheit (43 degrees Celsius) in the shade during midday hours, federal officials said Friday.

The hikers died in two separate incidents in the park’s inner canyon, where temperatures can top 109 degrees in the shade, officials said.

Federal officials say three hikers have died from apparent heat-related illnesses in the Grand Canyon