Police are warning the public about scams related to driveway paving. Though Norton police haven’t received recent reports of these scammers, a warning from the state has been posted on the department’s Facebook page, Lieutenant Todd Jackson said. The notice says a man may knock on the door and claim he has extra asphalt and is willing to pave your driveway at a discounted price. Before the job is finished, the scammer may claim he made a mistake on the price and use high-pressure tactics to demand thousands of additional dollars. The message originated from the Commonwealth Fusion Center, a multiagency office designed to share information about terrorism and public safety. Robert Sojka, a Massachusetts State Police lieutenant assigned to the Fusion Center, said senior citizens are often targeted for the scam. Residents who suspect a scam should call local police, Jackson said.