Canada has said it is "gravely concerned" about the arrests and has called for those detained to be released immediately.
They are involved in a human rights row over Canada's demands for Canadian activists jailed in the kingdom to be released.
Saudi Arabia expelled the Canadian ambassador on Monday and froze "all new business" with Ottawa over its criticism of the ultraconservative kingdom's arrest of women's rights activists - yet another warning to the West reflecting Riyadh's newly assertive foreign policy.
2, Chrystia Freeland, Canada's foreign minister, sent out a tweet regarding human rights in the Middle East kingdom. Samar is a vocal campaigner for her brother Raif Badawi, a blogger who was arrested in Saudi Arabia in 2012.
Analysts say the dispute between Riyadh and Ottawa shows Saudi Arabia won't accept any outside criticism and will continue flexing its muscles overseas, especially as the kingdom enjoys a closer relationship with President Donald Trump.
Freeland late on Monday also tweeted an official statement saying that Canada would "continue to advocate for human rights and for the courageous women and men who push for these fundamental rights around the world".
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While there were no official comments by the Canadian government on the post, the image was widely shared by Canadian and western media.
The United Arab Emirates, a strong regional ally, supported the Saudi response to Canada, with a senior government official calling Ottawa's behavior 'unacceptable'.
Badawi's wife Ensaf Haidar has been granted asylum by Canada, where she is raising their three children.
There are believed to be more than 12,000 Saudi students studying in Canada.
The Saudi students are part of a cohort of 1,200 worldwide students at UPEI.
When asked about the contract, Freeland said the government "looks forward" to hearing from Riyadh about the future of the deal.