"Another hateful act" targeted the mosque and its president Mohamed Labidi in addition to "a long series" of other incidents, the Islamic Cultural Center of Quebec said in a statement.
The fire was set on August 6 but was only made public on Wednesday in order to allow police to investigate.
Mosque officials and the mayor linked the fire to an August 4 announcement of the upcoming opening of the city's first Muslim cemetary.
"It would be a strange coincidence" if the two were not somehow related, said Quebec City mayor Regis Labeaume.
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Labeaume had championed the new Muslim cemetary as a sign of support for Quebec City's relatively small Muslim community following an avowed white supremacist's killing of six worshippers at a local mosque in January.
The "increase in hateful gestures" toward the Muslim community in Quebec City is "worrying," Labeaume commented.
These incidents come as nationalist or right-wing extremists in the Canadian province have become more vocal against immigration and "radical Islam."
In June, a group left a pig's severed head at the entrance of the mosque targeted by the lone gunman.
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