Police on both sides of the border are involved in a search for a man in the waters of Rainy River. OPP say the unnamed 27-year-old was with another who attempted a swim into the river and back to the Emo public dock last night. The one returned safely, but the other went under and never came back up. An OPP Marine unit, with help from Koochiching County Sheriff's Department are patrolling the area.