The country’s election commission said it was delaying the vote to 23 February due to unspecified “challenges”, amid reports that voting materials had not been delivered to some areas.

The delay is expected to spark anger in Africa’s most populous nation and largest democracy after many people had relocated for the chance to vote.

Mahmood Yakubu, chairman of the Independent National Electoral Commission (INEC), said: “This was a difficult decision to take but necessary for successful delivery of the elections and the consolidation of our democracy.”

A review of logistics led the commission to conclude that going ahead with the election as planned was “no longer feasible,” he said.

Nigeria also postponed its presidential election in 2015 because of deadly insecurity in the northeast of the country, which remains under threat from Islamic extremists.

More than 84 million voters had been expected to head to the polls on Saturday, in what is seen as a close and heated race between President Muhammadu Buhari and Atiku Abubakar, a billionaire former vice president.

:: ‘Four’ killed in stampede at election rally for Nigeria president

Both men have pledged to work for a peaceful election even as their supporters, including high-level officials, have caused alarm with warnings against foreign interference and allegations of rigging.

Mr Buhari made history when he came to power in 2015 with the first defeat of an incumbent Nigerian president.

That election was hailed as one of the most transparent and untroubled ever in Nigeria, which has seen deadly post-vote violence in the past.

Mr Buhari’s term has been marked by a crash in global oil prices that spun Nigeria’s economy into a rare recession, from which it only emerged in 2017.

Unemployment shot up and the country passed India as the nation with the most people living in extreme poverty. More than 13 million children are said to be out of school.

Many Nigerians also worry about Mr Buhari himself after he spent more than 150 days outside the country for an unspecified medical treatment.

In December, he bizarrely denied rumours he had died following a period of ill health and had been replaced by a Sudanese clone.

Meanwhile, Mr Abubakar has followed in the footsteps of US President Donald Trump by campaigning on the theme of “Let’s Make Nigeria Work Again”.

He has vowed to apply his business acumen to privatise Nigeria’s state oil company and lift 50 million people out of poverty by 2025, but has faced years of corruption allegations.

A guest at the lavish party, held in Bahia, northeastern Brazil, posted a picture showing Donata Meirelles sat on an elaborate, throne-like chair, flanked by black women in traditional white dress.

Critics likened the women’s clothes to the uniforms worn by house slaves, and pointed out the chair’s similarity to one commonly used by slave masters.

Marie Claire columnist Stephanie Ribeiro said on Twitter: “The black women were used as objects to create an exotic scene.

“It’s reminiscent of colonialism and romanticises those times. She was recreating the image where whites are superior and blacks are dehumanised.”

Ms Meirelles insisted in an Instagram post that the chair was an artefact from the Afro-Brazilian folk religion candomblé, and the clothes were traditional Bahian party attire.

“Even so, if I caused any different impressions, I am sorry,” she added.

In a statement on Instagram, the magazine said: “Vogue Brasil profoundly regrets what happened and hopes that the debate that has been generated serves as a learning experience.

“We believe in affirmative and purposeful actions and also that empathy is the best alternative for the construction of a more just society, in which the historical inequalities of the country are debated and faced.

Vogue has said it will also create a panel of activists and academics to help produce content to combat inequalities.

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Rahoton da kungiyar Save the Children ta fitar, ta ce shekaru biyar da suka gabata, jarirai dubu dari biyar ne ke mutuwa a kowacce rana, sanadiyyar yaki.

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Haka kuma ba a sanya yaran da suka mutu a lokacin da ake gwabza yakin ba, ko dai ta harbin bindiga, ko tashin bam ko rikitowar gine-gine.