The Al-Huda Elementary School in Mississauga city in Ontario suspended the classes for Tuesday (yesterday).
The school in Canada is the branch of Pakistan's Al-Huda Institute in Multan, one of Pakistan's most high-profile religious seminaries for women, where San Bernardino shooter Tashfeen Malik had studied.
Parents of the some 160 children who attend the school were told to check their email for more information about when classes would resume, the CBC News reported.
The oldest of the four teenagers has been living in Syria since last year. The other three were stopped by security officials in Turkey and brought back to Canada.
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"Al-Huda Institute Canada would like to be clear that law enforcement authorities have never brought forward any allegations that four girls associated with the Institute traveled to join terrorist organisations," the school's operations manager Imran Haq said.
Tashfeen Malik, one of two shooters involved in the deadly attack in US' San Bernardino in which 14 people were killed, attended Al-Huda's Pakistan campus.