Investigators in Las Vegas say they're looking for the grandfather of a kidnapped 6-year-old boy with the hope he can lead them to the child. Investigators say Cole Puffinburger was abducted from his mother's home on Wednesday by two Mexican nationals posing as police officers. Authorities think the grandfather was involved in drug dealing, and the boy's kidnapping was a ``message.''Las Vegas police Capt. Vincent Cannito says, 'We do believe that the money is the primary target. They went it and ransacked that home and as a form of ransom, they kidnapped Cole.' They say the grandfather stole a large sum of money and Cole was taken as collateral.A nationwide amber alert remains in effect.