A bomb scare on Tuesday was in a Mascouche neighbourhood where many family members of Charbonneau witness Piero Di Iorio live.
It turned out to be a false alarm and investigators found no explosives.
Police would not release the name of the person targeted, but did confirm that it was an Italian family.
Former Vice-President of the now defunct Excavations D.P., Di Iorio has testified before the Charbonneau inquiry, saying that the Sicilian Mafia has been colluding in the Montreal construction industry for more than 30 years.
The 911 call came in just after 6 p.m. Police evacuated at least five families from their homes and set up a security perimeter around 335 place de Cheverny for close to four hours.
On Nov. 10, a fire that is considered suspicious damaged Di Iorio's daughter's home.
Mascouche police confirmed that investigators will continue to look at whether the two events are linked.