Stamford police are warning storeowners about a group of thieves using gypsy methods to get away with thousands of dollars.Police say six to eight con artists walk into the store, cause a diversion and then steal cash. A surveillance video taken September 21 from a Krauser's convenience store in Milford shows how a female in the group is able to crawl into the store office undetected and help herself to the owner?s cash. Police say the group of con artists are suspected to be European gypsies. They also believe the group, who may have entered the U.S. illegally, is made up of Romanian descent. The suspects have duped storeowners across the country. They've already been arrested in California, Maryland, and outside the U.S. in Canada.Police report the suspects in Milford drove off in a gray Dodge caravan with New York plates. The partial plate number is 931-HD. They are asking for anyone with information to call the Stamford Police Department.