News Tires slashed in River Valley SHARE ON: Rocco Frangione, staff Wednesday, Jun. 12th, 2019 OPP inherit tire slashing case from former West Nipisisng police. (Stock photo) One of the holdover cases from the former West Nipissing Police is a tire slashing incident that the Nipissing West OPP is now in charge of. The incident took place in the River Valley area on May 30th. The owner saw that someone committed mischief by slashing the tires on his vehicles. Whoever was behind the mischief also broke one of the windows on the vehicle.