ONTARIO (CBSLA.com) — Authorities are investigating a triple homicide in Ontario on Monday.

A resident called police around 6:15 a.m. and told them they could see a man’s body lying in the driveway of a residence on the 1000 block of South Magnolia Avenue, according to Sgt. David McBride from the Ontario Police Department.

The neighbor also said they could see one more victim inside the home.

Officials arrived to the scene and found a man shot to death in the driveway.

Two other men were found dead inside the house.

Police also discovered rifles and marijuana in the structure.

The three men, described to be in their mid-30s, haven’t been identified.

KCAL9′s Juan Fernandez said two of the victims were African-American and the other was Latino.

Investigators don’t believe the incident was a murder-suicide.

“We don’t know the relationship between the three males. They could have been acquaintances. We could have victims and suspects here,” said McBride.