An independent investigation into the role of Dublin City Council employees in the payment of protection money to allow social housing construction has been completed.

DCC Chief Executive Owen Keegan said the results of independent investigation were submitted to Minister for Housing, Planning and Local Government Eoghan Murphy last December.

The investigation by Patrick Butler SC was ordered after the High Court had heard that two council official advised builders to contact local criminals to stop a series of attacks and that one official provided a phone number.

In a written response to Independent councillor Mannix Flynn, Mr Keegan stated: "The department has indicated that the report is under consideration and that a number of issues have to be finalised before the process will be fully completed."

He said there is also an on-going garda investigation into events at construction sites in Cherry Orchard.

The High Court heard construction firms paid two local criminals, Derek 'Dee Dee' Driscoll and David Reilly, €1,200 and €1,500 a week for a fictitious fencing maintenance service, according the Criminal Assets Bureau.

This followed a series of attacks on sites and workers which brought work on modular housing to a halt in December 2016.

Stolen cars were driven though a steel perimeter fence of one site, a Portacabin was burnt out and an employee had to run from a digger after it was set alight with petrol - he was hit by a brick and broke his ribs as he ran from the vehicle. 

Following an application by CAB, High Court ordered the seizure of nearly €300,000 worth of assets belonging to Driscoll and Reilly.