The investigation into who set a wildfire along the Garden State Parkway in March is at an impasse because of uncooperative witnesses. Ocean County Prosecutor Bradley Billhimer. said the fire was intentionally set but has not disclosed details about how the fire started or a motive for starting it. He said on Monday that investigators have reached an impasse because nearly five dozen potential witnesses will not speak. "Detectives have attempted to interview approximately 60 potential witnesses and reviewed video recordings from cameras in proximity to the fire," Billhimer said in a written statement. "The vast majority of these potential witnesses have been less than cooperative with our investigation, and as such, we are currently at an impasse at this point in time."