The referendum approves 18 constitutional amendments that will replace Turkey's parliamentary system of governance with a presidential one.
In their petitions Tuesday, the residents of Ankara said the decision and other reported irregularities were in open violation of the law.
Human Rights Watch (HRW), a US-based worldwide nongovernmental organization that conducts research and advocacy on human rights, said on Monday that Turkey's government and president should reverse the decision to extend the state of emergency after winning the April 16 presidential referendum and end the wave of political repression unleashed in the months before the vote. But it has been particularly outraged by an electoral board decision, announced as the polls closed Sunday, to accept ballots that didn't bear the official stamps used to verify they are genuine, as required by Turkish law.
The French government said it would "follow with great care" the worldwide monitors' final report in coming weeks, particularly in relation to a reported last-minute change of rules by the electoral boards to allow ballots that had not been officially stamped.
The head of Turkey's Supreme Electoral Commission, Sadi Güven, confirmed that "yes" had narrowly clinched the victory, based on unofficial results.
Turkey's main opposition party has slammed the country's electoral board, accusing it of bias and favoring the ruling party.
Turkish President Recep Tayyip Erdogan called victory on Sunday after 51.4 percent of Turkish voters backed switching to a presidential system and vesting the president with powers to appoint top judges, declare a state of emergency, dismiss the parliament, remain party leader while in power and serve extra terms. He accused the board of "changing the rules midgame".
Before the electoral board's announcement, Prime Minister Binali Yildirim said the opposition had the right to file objections, but warned that calling for street protests was unacceptable.
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President Muhammadu Buhari has congratulated the people and government of Turkey on the successful conclusion of the country's referendum on Monday.
A senior official with the Trump administration said the President did not raise any concerns about the referendum with Erdogan, describing that part of the phone call as a "simple congrats".
Anadolu news agency cited a statement by Istanbul Police that said the suspects were detained early Wednesday for attempting to provoke a response similar to the mass anti-government demonstrations that happened across Turkey in 2013.
The new system takes effect at the next election, now slated for November 2019.
Asked to comment about Erdogan's rebuke, de Zulueta said: "I don't have an opinion, we are invited by the Turkish authorities to observe".
Election monitors from the Organization for Security and Cooperation in Europe were seen entering the High Electoral Board headquarters in Ankara. "Because we do not have the authority to forgive the murders of our martyrs", Erdogan said at a rally Monday.
"President Trump and President Erdoğan also discussed the counter-ISIS [Islamic State of Iraq and the Levant] campaign and the need to cooperate against all groups that use terrorism to achieve their ends", it said.