New Jersey insurance fraud officials are investigating a Fort Lee pain treatment center linked to two patient deaths, said a spokesman for state Attorney General Peter C. Harvey.

The spokesman, John Hagerty, declined to elaborate, but a source close to the investigation said the state will try "to determine the nature and cause" of the deaths. Investigators are also examining the Fort Lee Surgery Center's records, patient charts and billing practices "to see whether the treatments provided to a large number of patients were medically necessary."