Las Vegas ? Authorities investigating the abduction of a 6-year-old boy from his Las Vegas home focused Saturday on three people, including a Mexican citizen and the youngster’s grandfather, who they said may have stolen millions of dollars from drug dealers.

The Mexican man, identified as Jesus Gastelum, is in his mid-30s and believed to be in Las Vegas or Southern California, police said at a news conference. The other “person of interest” was not identified.

Authorities already had arrested the grandfather of Cole Puffinburger, who was abducted Wednesday morning by two men posing as police officers. Police said they believe that the men were Mexican drug dealers and that the kidnapping at gunpoint was a “message” to the grandfather, Clemens Tinnemeyer, 51.

Tinnemeyer was arrested late Friday in Riverside, Calif. He was being held in nearby San Bernardino, and authorities hope his arrest will help lead them to Cole’s abductors.