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AKP supporters hold banners and flags as they celebrate and greet Turkish president during his speech at the conservative Justice and Development Party (AKP) headquarters in Istanbul, on April 16, 2017, during a rally, after the results of a nationwide referendum that will determine Turkey's future destiny. Erdogan on April 16, 2017 hailed Turkey for making a "historic decision" as he claimed victory in the referendum on a new constitution expanding his powers. The "Yes" campaign to give Turkish President expanded powers won with 51.3 percent of the vote a tightly-contested referendum although the "No" camp had closed the gap, according to initial results. But Turkey's two main opposition parties said they would challenge the results. (KEYSTONE/NAR PHOTOS/Kerem Uzel)