(Longview, WA)  --  Police in southwestern Washington state are warning residents about a possible card skimming device at a gas station in Longview.  Police say a patron found the suspected skimming device on a card reader at the Ocean Beach Chevron.  The patron made the discovery after receiving a fraud alert on his bank account shortly after using his credit card to purchase gas at the station.  Police say the device does appear to be a card skimmer, but an investigation is ongoing.