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Liberia election: Sirleaf faces Tubman challenge Liberia election: Sirleaf faces Tubman challenge
(40 minutes later)
Long queues have formed outside polling stations, as Liberia prepares for its second election since the end of a 14-year civil war.Long queues have formed outside polling stations, as Liberia prepares for its second election since the end of a 14-year civil war.
President Ellen Johnson Sirleaf, 72, is expected to face her strongest challenge from former UN envoy Winston Tubman, a nephew of an ex-president.President Ellen Johnson Sirleaf, 72, is expected to face her strongest challenge from former UN envoy Winston Tubman, a nephew of an ex-president.
Africa's first elected female head of state was awarded the Nobel Peace Prize last week.Africa's first elected female head of state was awarded the Nobel Peace Prize last week.
But Mr Tubman, 70, says she has not done enough to tackle corruption.But Mr Tubman, 70, says she has not done enough to tackle corruption.
Mrs Sirleaf won the 2005 elections after the conflict ended in 2003.Mrs Sirleaf won the 2005 elections after the conflict ended in 2003.
She defeated former football star George Weah, who is Mr Tubman's running mate this time.She defeated former football star George Weah, who is Mr Tubman's running mate this time.
The BBC's Jonathan Paye-Layleh in the capital, Monrovia, says people started queuing to vote before dawn despite the heavy rain.The BBC's Jonathan Paye-Layleh in the capital, Monrovia, says people started queuing to vote before dawn despite the heavy rain.
Voting is due to start at 08:00 GMT. He says everything appears ready at the polling station where he is in the city centre.
Mrs Sirleaf had said she would only seek a single term but explained her U-turn by saying she wanted to finish the work she had started.
Our correspondent says central Monrovia has been transformed since the end of the war, with roads paved and many new buildings.
While Mrs Sirleaf is well regarded by the international community, some analysts she is less popular at home and predict a tight race, possibly going to a run-off.
Her 15 challengers accuse her of not doing enough to improve the lives of ordinary people, who remain among the poorest in the world.
"One out of every three Liberians cannot feed themselves. They live in abject poverty. And they couldn't care less about the Nobel prize," said 60-year-old opposition candidate Charles Brumskine.
The campaigning was generally peaceful but some 8,000 UN peacekeepers have spread across the country to prevent any violence.
Voting is due to end at 18:00 GMT.
Voters are also choosing 88 members of the legislature.
Liberia is Africa's oldest republic - it was founded in 1847 by freed US slaves, hence its name.