Authorities at the Grand Canyon say three people died when a motor home caught fire at the national park's south entrance.
Witnesses reported smoke in the cab of the RV on Monday morning. It was fully engulfed when firefighters arrived. Authorities later found the remains of three people inside.
Grand Canyon spokeswoman Shannan Marcak says authorities have cordoned off an area just south of the entrance as investigators comb through the blackened debris to figure out what caused the fire.
Capt. Mark Johnson, a Flagstaff Fire Department spokesman, says crews remained at the scene until late Monday before turning it over to an evidence response team.
The Coconino County Health Department says the remains have been taken to the medical examiner's office, but the results of autopsies won't be immediately available.