Police in both Western Massachusetts and Cambridge have issued warnings about credit card skimming devices found at local businesses. In Western Massachusetts, skimmers were detected at two Cumberland Farms locations, prompting police to advise vigilance when using debit and credit cards. Meanwhile, a skimmer was discovered on a payment terminal at a retail business on Massachusetts Avenue in Cambridge, although the specific store remains undisclosed. Police urge anyone who has used their cards in these areas to monitor their financial statements for any unauthorized transactions. Tips for avoiding skimmers include checking for tampering on machines, inspecting keypads, and covering PIN entries. Authorities emphasize the importance of staying alert and proactive to prevent becoming victims of card skimming.