Federal authorities are investigating a suspected embezzlement of potentially millions of dollars from a St. Louis area medical practice, according to a source close to the investigation. The FBI and U.S. attorney's investigation comes on the heels of the termination by Metropolitan Urological Specialists PC of Dunard Morris, who until recently served as its chief executive. The investigation focuses in part on whether money was diverted from the firm's bank loans, the source said. The amount of missing money isn't known but could be millions, the source said. The medical practice also maintains that Morris subleased a $5,475-a-month luxury apartment using company funds without approval of the firm's board of directors.