A man police believe is responsible for three summertime bank robberies appears to have struck again. Durham regional police say a man walked into a Royal Bank in Oshawa on Saturday and demanded cash. He said he was armed, although no weapon was seen. Since august, the same man is suspected of robbing a national bank in Kingston, a BMO in Richmond Hill and another RBC in Napanee. The suspect is 30-40 years of age with a heavy build and a full beard. He was wearing a white dress shirt, jeans a blue jays cap and prescription glasses. The investigation is now in the hands of multiple jurisdictions – and the word is spreading throughout the province. Call police if you have any information.