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Argentina will face a run-off election next month after neither presidential candidate gained enough votes to win the poll outright, according to the BBC.

Centre-left candidate Daniel Scioli led exit polls, and just edged centre-right Buenos Aires mayor Mauricio Macri with most votes counted.

Many had expected Mr Scioli to lead by a greater margin. The run-off on 22 November will be the first time an Argentine election will be decided by a second round.

With 96% of the votes counted, Mr Scioli was marginally ahead with 36.7% of the vote, while Mr Macri had 34.5%.

To win outright in the first round, a candidate needed 45% of the vote or a minimum of 40% as well as a 10-point lead over the nearest rival.

"What happened today will change politics in this country," Mr Macri, the mayor of Buenos Aires, told supporters. Sergio Massa, a former ally turned rival of outgoing President Cristina Fernandez de Kirchner, came a distant third with 21.3% of the vote and admitted defeat.

Mr Massa has not said who will get his backing in the second round next month. With Mr Macri and Mr Scioli neck-and-neck, Mr Massa's support could prove crucial.