About 260 people are thought to be involved in an alleged $150 million mortgage fraud racket involving hundreds of Sydney homes.
According to a report by the ABC murdered Sydney businessman Michael McGurk has been linked to the mortgage scam in which false documents were used to raise mortgages on residential and commercial properties.
Mr McGurk was gunned down outside of his Cremorne home earlier this year.
While Fraud Squad commander, Detective Superintendent Col Dyson, would not comment whether the scam led to the eventual murder of Mr McGurk, he said the police had been investigating Mr McGurk prior to his death.
Decetctive Dyson said it was believed the mortgage scam started in 2002 with a bank employee identifying properties that could be subject to fraudulent loans.
It is alleged the fraud racket has, since that time, defrauded NAB of $3.9 million.
Yesterday, a 36 year old Connells Point man and a 43 year old Yagoon woman were arrested in relation to the scam.
So far, 11 people have been arrested and police are currently in the process of questioning others.