Elections in South Africa
South Africa's President Cyril Ramaphosa is under growing pressure after leading the ruling African National Congress (ANC) to its worst election result in 30 years, forcing it to share power.
With almost all the votes in, the ANC is on 40% - down from 58% at the previous election.
This is lower than the party's feared worst-case scenario of 45%, analysts say.
The ANC has always polled above 50% since the country's first democratic elections in 1994, which saw Nelson Mandela become president.
But support for the party has been dropping significantly because of anger over high levels of corruption, unemployment and crime.
Citing the cost-of-living crisis and frequent power cuts, one woman told the BBC she had voted for the ANC for the past 30 years, but had backed the centre-right
Democratic Alliance (DA) this time.
"This result is not good. I wanted it out of government. We need to give someone else a chance," she said.
The final results will be announced at 18:00 local time (17:00 BST) on Sunday, the BBC understands.
This is when we will know exactly how many seats each party has in the National Assembly, although South Africa has a strict system of proportional representation, so we already have a pretty good idea.
The ANC leadership, including President Ramaphosa, is currently discussing the way forward and preparing for complex coalition talks, a source told the BBC.
Its options are a coalition with the DA, which is in second place on 22%, or the uMkhonto weSizwe (MK) party led by former President Jacob Zuma, on 15%.
The radical Economic Freedom Fighters (EFF) is on 9%, so a coalition of those two parties would fall just short of the required 50%.
The new parliament must be sworn in within two weeks of the final results and the new president would normally be chosen then.
Both the EFF and MK advocate seizing white-owned land and nationalising the country's mines - policies which would alarm foreign investors.
The MK has said it would be prepared to work with the ANC, but not while it was led by Mr Ramaphosa.
He replaced Mr Zuma as both president and ANC leader following a bitter power struggle in 2018.
MK supporters have been celebrating overnight in Durban, the biggest city in the party's heartland of KwaZulu-Natal province. The party was only formed in September.
ANC chairperson Gwede Mantashe said his party was unlikely to form an alliance with the DA.
He said there would have to be "policy alignment" between parties to form a coalition agreement.
For the ANC, its black empowerment policies - aimed at giving black people a stake in the economy following their exclusion during the racist apartheid era - were "non-negotiable".
