BILLINGS - Police are investigating a stabbing at the Billings Skate Park.Police said on social media the stabbing at the downtown park was reported Sunday at about 9:30 p.m.A 21-year-old man was stabbed in the skate park parking lot, police said. He was taken to the hospital with non-life-threatening injuries."Incident does not appear to be random, and other parties involved have been tentatively identified," police said.No other information was immediately released.