Internet access in Syria is provided solely by the government-run Syrian Telecommunications Establishment.
There are four telecommunication cables that connect Syria to the Internet. Three are underwater and the fourth runs overland through Turkey.
However, CloudFlare doubts that the disconnect was performed physically.
"The systematic way in which routes were withdrawn suggests that this was done through updates in router configurations, not through a physical failure or cable cut," the CloudFlare blog said.
CloudFlare provided a video of the shutoff occurring in real time, letting viewers watch an entire country lose Internet access.
Nationwide Internet cutoffs were among the last-ditch efforts by Libya's and Egypt's former dictators to save their regimes before both fell during the Arab Spring uprisings last year.
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