The district attorney in suburban Westchester County, N.Y., has subpoenaed property-tax records related to one of former president Donald Trump’s golf clubs, signaling a previously unknown criminal inquiry into the Trump Organization.

The town of Ossining, N.Y., which sets property tax rates for the course, received a subpoena from Westchester District Attorney Miriam “Mimi” Rocah several weeks ago, according to an Ossining official. The town “has been fully cooperative,” said the official, who declined to be named because the subpoena was not public.