Sudan's election commission said Kiir, leader of the Sudan People's Liberation Movement (SPLM), had received 93% of the southern vote.

The polls were Sudan's first multi-party elections in 24 years.

Observers and opposition parties have complained of fraud and - particularly in the south - of intimidation.

A referendum is due in 2011 on whether the south, where most people are Christian or follow traditional religions, should secede from the Arab-dominated mostly-Muslim north.

Bashir has said he would respect the outcome of the referendum but some fear conflict could resume, especially in the oil-rich border region, according to the BBC.

Speaking in a televised address after the poll result was announced, Bashir said: "The referendum in south Sudan will take place on schedule."

He described his election win as a victory for "all Sudanese", and played down criticism of the poll, praising "the civilised and respectful conduct during these elections, which saw no clashes or friction".

The EU and the Carter Center said the polls were below international standards. But former US President Jimmy Carter said he believed the international community would recognise the winners all the same.