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Angola's governing MPLA party looks set to extend its almost 50-year-long stint in power, holding off a challenge from its former civil war enemy, Unita.
With more than 97% of the votes in Wednesday's election counted, the MPLA was polling about 51% against 44% for Unita, electoral officials say.
This gives President João Lourenço a second five-year term in office.
Unita said earlier it was considering contesting the results because they did not correspond to reality.
"We hope there can be common sense, we are not encouraging a rebellion, the process is not over, we must remain calm," senior Unita member Anastacio Ruben Sicato was quoted as saying by the AFP news agency.
Wednesday's poll had been billed as Angola's most closely-fought election since independence in 1975.
The BBC's Israel Campos in the capital, Luanda, says that despite Angola being rich in oil and minerals such as diamonds, many people have not benefitted from that wealth.
And while the 20 years of peace after a protracted civil war have been welcome, they have not brought the gains that many hoped for, he says.
Angola's unemployment rate is around 30%, but among the youth that figure reaches 60%, official statistics say.
The MPLA has governed Angola since independence.
Mr Lourenço came to power in 2017 after long-standing leader José Eduardo dos Santos stood down.
His anti-corruption campaign has opened a rift with the Dos Santos family, some of whom have been sent to prison.
Dos Santos died last month in Spain, and his body was repatriated last weekend.