The controversial MetroLink works which began before the underground rail system was granted planning permission are now under investigation by Dublin City Council.
The Public Accounts Committee, which monitors the spending of state funds, is also investigating whether the €12.5 million works went through tender and procurement processes, Dublin Live previously revealed.
The construction for the foundations for the proposed Charlemont stop of the underground rail system began a number of weeks ago despite the project not being granted a Railway Order.
