The Phoenix Police Department is investigating after a 25-year-old man was found dead with his head submerged in a toilet Friday, officials said.

Phoenix Fire Department crews were called to a home in the area of 84th Avenue and Apache Street on reports of a drowning, according to fire spokesman Capt. Rob McDade.

The man was pronounced dead at the scene, McDade said. The Phoenix Police Department is taking over the scene and is investigating the death, according to McDade.

Police believe the man's death may be connected to a recent illness and there are "no obvious signs of foul play," according to Sgt. Vince Lewis, a Phoenix police spokesman.