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The evening march from a central square to a sprawling memorial complex began with activists burning a Turkish flag.
Historians estimate that, in the last days of the Ottoman Empire, up to 1.5 million Armenians were killed by Ottoman Turks in what is widely regarded as the first genocide of the 20th century.
Armenians have long pushed for the deaths to be recognised as genocide.
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Armenia on Saturday formally observes Genocide Remembrance Day, marking the start of the killings in 1915.