Unofficial results show incumbent Mustafa Akinci and right-wing candidate Ersin Tatar trading the lead several times, but neither getting required majority to win outright.
Also responding to Washington's decision, TRNC President Mustafa Akinci says it "was not a step in the right direction."
The EU's sanctions coupled with the international community's endorsement of Greek Cypriot unilateralism dims the hopes for 'gas-for-peace'.
Turkish Defence Minister Hulusi Akar made clear that Turkey will not sit and watch without doing anything, while others drill for oil and gas.
Turkish Vice President Fuat Oktay says Greek Cypriot side is abusing its EU membership to stop Turkey's drilling activities in the eastern Mediterranean.
Ankara and the EU are at loggerheads over who has the right to explore newly-discovered gas fields.
The Turkish government is standing firm on its oil and gas exploration in the Eastern Mediterranean as Greece and Greek-administered Cyprus call on the European Union to take action against Turkey.
Maronite Christians used to live in a handful of villages in the north of the island, but most left when fighting started between Turkish and Greek Cypriots and the island was partitioned in 1974.
The fifth Mediterranean conference, hosted in the divided capital of Nicosia, in Cyprus, produced a joint declaration which favoured Greek Cypriot political positions, angering Turkey.
The opening of the Dherynia border post in the east and the Lefka crossing in the northwest is the first such step to end the 44-year frozen conflict between Turkish Cypriots and Greek Cypriots in eight years.
Turkey reminds Greece of a 1995 parliamentary declaration in which Ankara authorised action, not excluding military action, to safeguard Turkish interests in the Aegean.
Turkey's first drilling ship is all set to become operational in the Mediterranean Sea and another ship will follow soon, according to Turkish Energy and Resources Minister Fatih Donmez.
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