The Grand County Sheriff's Office is looking for two people who stole a handgun from the scene of a murder-suicide, where investigators believe a 62-year-old man shot and killed his 9-year-old boy.Grand County Sheriff Rodney Johnson said the bodies of 62-year-old William Ahrold and his son Jackson Ahrold were found in a van over the weekend. The Ahrolds were reported missing by the Denver Police Department on Dec. 13 and were last seen on Dec. 9."They both died from gunshot wounds and preliminary indications are it was a murder suicide," Johnson said.However, the investigation is complicated by the fact that William Ahrold's handgun is missing.Johnson said investigators believe a person or several people came upon the crime scene before deputies arrived and stole several items, including the handgun."All indications are the (unknown subjects) didn't have anything to do with (the deaths). But our theory could be upset based on other evidence," Johnson said.The Grand County Sheriffs Office is asking for help from other law enforcement agencies to find the thieves.The alert issued on the Denver police radio Tuesday morning said, "Considered armed and dangerous, 9 mm handgun stolen from a homicide from Grand County. Unknown direction of travel on the vehicle -- a green 97 4-Runner 324XEV out of Colorado."Officers also appeared to be searching for a 51-year-old white man with brown hair and a 40-year-old woman with blond hair. However, at noon, Johnson said he's learned new developments that lead him to believe that some of the information in the BOLO may be incorrect, but he did not release any more information about the suspects.The van with the two victims was discovered by a BLM employee just off Country Road 1, at the end of County Road 102, near the Colorado River, around noon Saturday.Investigators said it appeared the bodies had been there for several days.The Grand County Coroner planned to perform an autopsy on the victims on Tuesday.