Prosecutors in California say a 15-year-old boy who had returned home after running away to Occupy Oakland, strangled his foster parents and stuffed their bodies in a car. He will be tried as an adult. 

Colleagues of his dead parents told the San Francisco Chronicle that the victims had fought with their adopted son because he was spending time at the Occupy Oakland camp.

Moses Kamin was arraigned in Alameda County Superior Court for allegedly murdering Robert Kamin, 55, and Susan Poff, 50. Kamin faces two counts of murder and, if convicted, a life sentence without the possibility of parole.

Police detained the youth on Friday after the bodies of his foster parents were discovered in a red PT Cruiser parked outside the family house, according to the Oakland Tribune. Scorch marks were found on the car because Kamin had attempted to set the gas tanks on fire. After he confessing the details of the crime, police said, they formally arrested him on Saturday morning.

Kamin was adopted by Kamin, a clinical psychologist in the San Francisco jail system, and Poff, a physician with the San Francisco Department of Public Health's Housing and Urban Health Clinic, in 2002.

Authorities said that Kamin was vague on the reasons for murdering the couple. However, they said, growing tensions were to blame. Police said that last November Kamin ran away to protest with Occupy Oakland. Authorities also speculate he may have attempted to burglarize his own home and stolen a family car, reported the Oakland Tribune. It is not clear when he returned home, but last Wednesday he was suspended from school.

Then, around 6 p.m., police say, Kamin and his mother got into an argument about the suspension, and he strangled and killed her. He hid her body in a dark room and waited for his father to return home. He attacked him from behind, killing him.

When Robert Kamin did not show up for work the next day, coworkers alerted the authorities. When they went to investigate, Moses answered and found nothing out of the ordinary. However, when they returned they discovered the scorch marks on the car and began questioning Kamin.