Democratic Alliance edged ahead of incumbent Socialists in nail-biting count that saw far-right surge.
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Three polls show the right-leaning parties combined, including far-right Chega, could secure an outright majority.
Voters head for the polls in an early election that could see country join a shift to the right across Europe.
Chega, an Islamophobic nationalist party, is predicted to win a large chunk of support in Sunday’s vote.