UNINCORPORATED CRYSTAL LAKE, Ill — Three female family members were found dead, and one seriously injured, inside a house in Unincorporated Crystal Lake, authorities have confirmed.

According to police, the suspected gunman has also died.

The shooting happened just before 4 a.m. Wednesday on the 5800 block of Wild Plum Road. Officers were dispatched to a residence for the report of a “single household member shooting their relatives.”

Upon arrival, police found a total of five people inside the house. Three females were pronounced dead on the scene.

Another female, who initially called 911, was seriously injured and transported to an area hospital.

A male, who is believed to be the aggressor, was transported to an area hospital where he later died.

Police said the five people all lived in the house.

According to authorities, this is an isolated incident and there is no danger to the public.

The McHenry County Sheriff’s Office has opened a death investigation.