 Police say they were notified around 11 p.m. last night that the boys did not return home by curfew after they went to the Springvale Recreation Holdsworth Park to swim. Sanford police and fire began searching the area where they found a vehicle belonging to the teens. The chief medical examiner's office will perform autopsies to determine cause and manner of death as part of the ongoing investigation with Sanford Maine Police. Through police say foul play was not believed to be a factor in their deaths.