CRAWFORD COUNTY, ARKANSAS—The U.S. Forest Service is investigating a man who may have illegally excavated prehistoric artifacts from the Ozark-St. Francis National Forest in Arkansas, according a report from 5News. The television station’s report is based on a search warrant affidavit from the U.S. Attorney’s Office of the Western District of Arkansas. The investigation began in May 2015, when the Forest Service received an anonymous tip that the man’s Instagram account contained evidence of what appeared to be illegal digging in the National Forest. Based on photos from the account, officers set up cameras to monitor several areas, which captured further evidence. According to the 5News report, an Ozark National Forest archaeologist told investigators that many of the artifacts in the photos would not have been found on the ground surface. No charges have been filed pending completion of the investigation. To read about Native American rock art sites in Arkansas, go to "Off the Grid."