Argentines have been voting to choose a new president to replace Cristina Fernandez de Kirchner, who is constitutionally barred from seeking a third term.

Ms Fernandez, who stands down after eight years in power, says she leaves Argentines a better country.

Long queues formed outside polling stations from the early hours of Sunday.

Her hand-picked successor, left-winger Daniel Scioli, led opinion polls, he is facing a strong challenge from the centre-right mayor of Buenos Aires, Mauricio Macri.