MESA, Ariz. -- Maricopa County sheriff's detectives are investigating a possible double homicide in Mesa. Sheriff Joe Arpaio said the bodies of an older man and younger woman were found inside a camper behind a home on Akron Street near Crismon Road and Main Street. The sheriff's office received the call around 7:30 p.m. Monday after the discovery was made by someone living inside the home. The relationship between the victims isn't known, but the sheriff's office believes about five people were living inside the house.Arpaio described the scene as gruesome but didn't release details about how the two people were killed.The victims' identities and relationship have not been released.Homicide detectives were on scene through the night. They were still working early Tuesday morning.Information will be updated as it become available.