Officers with UPAC, Quebec's anti-corruption squad, have been busy conducting raids throughout the city today.
Reports are suggesting the force is targetting the homes of former construction boss Tony Accurso, former Montreal executive committee chairman Frank Zampino and former city manager Robert Abdallah, among others.
Both Zampino and Abdallah were key figures in the administration of former mayor Gerald Tremblay.
Abhdallah has been linked to a kickback scheme in testimony at the Charbonneau Commission. Pictures of Abdallah on Accurso's infamous yacht and on other holidays have also surfaced at the Commission's hearings.
A spokesperson for UPAC could only confirm that its officers were executing warrants today, but gave no other details.
No arrests have been made.