A 73-year-old man has not been seen in more than three weeks after authorities found his empty RV at a remote Adirondack Mountains campsite in upstate New York, state troopers said.According to the New York State Police (NYSP), Craig K. Streeter, of Mahopac, was last seen Aug. 2 at a Stewart’s Shop in Indian Lake.Police say it’s not unusual for him to go off the grid for short periods, but he hasn’t been contacted in weeks.MISSOURI DEPUTY AG, MISSING 6 DAYS AFTER SEEKING TO SUMMIT WYOMING’S TALLEST PEAK, IS FOUND ALIVEThe search was launched after New York State Forest Rangers discovered Streeter’s RV at campsite 36 on Moose River Road in the town of Inlet with no sign of recent activity.GET BREAKING NEWS BY EMAILWhen authorities were unable to locate the outdoorsman, they called in additional law enforcement agencies to join the effort. The search is ongoing and involves multiple agencies, the NYSP said.FOLLOW US ON XCLICK HERE FOR MORE U.S. NEWSPolice said there are no indications of foul play as of now.GET BREAKING NEWS ALERTSHe was last seen wearing a dark-colored long-sleeved shirt and jeans before leaving the store in his RV.SEND US A TIPGOT A TIP?Authorities are interested in hearing from anyone who may have encountered Streeter while camping or traveling along Moose River Road or in nearby remote camping areas. Anyone with information is asked to call New York State Police at 518-897-2000.Fox News Digital has reached out to the New York State Police for additional information.LIKE WHAT YOU’RE READING? CLICK HERE FOR MORE