Nigeria's main opposition candidate Atiku Abubakar has won in the northern states of Sokoto and Kaduna, according to provisional results released on Tuesday morning.

He narrowly won in Sokoto with 288,679 votes against the ruling party candidate Bola Tinubu's 285,444 votes.

Labour Party's Peter Obi got 6,568 votes.

The opposition won a more convincing victory in Kaduna state, with Mr Abubakar getting 554,360 votes against Mr Tinubu's 399,293 votes.

Results released at the state level need to be certified and announced by the Independent National Electoral Commission (Inec) chairman.

The announcement of results for the southern oil-rich state of Rivers have been suspended as the electoral official in charge has complained of death threats.

Charles Teddy Adias said he and his family had been threatened by those alleging he intended to rig the results - which he denies.

He says he will not collate any further results until this matter is addressed by the Independent National Electoral Commission (Inec).

The BBC's Nduka Orjinmo says Rivers state is a PDP stronghold but many of its young educated residents are supporters of Labour Party candidate Peter Obi.

There are also indications that its powerful governor Nyesom Wike, who is leading a rebellion within the PDP after losing at the primary last year to Atiku Abubakar, is backing the ruling APC party.

Our reporter says this will affect matters at the national collation centre in the capital, Abuja, as a winner cannot be announced until all the results are first collated at the state level.

Labour's Peter Obi has won presidential elections in Cross River state, according to provisional results released on Tuesday.

He won by 179,917 votes, followed by the ruling party's Bola Tinubu’s 130,520.

Opposition politician Atiku Abubakar got 95,425 votes.

The win is Mr Obi's fourth state win after victory in Lagos, Enugu and Nasarawa states.

Results at the state level need to be certified and announced by the Independent National Electoral Commission (Inec) chairman.

The ruling party's candidate has 44% of tallied votes, but the opposition says counting is flawed.

Image source, AFP

In Kano state, Rabiu Kwankwaso of the New Nigeria Peoples Party (NNPP) has been declared the winner in the presidential elections with 997,279 votes.

He was twice a governor of the state - from 1999 to 2003 and 2011 to 2015.

In the election results, he was followed by Bola Tinubu of the ruling All Progressives Congress, with 517,3411 votes.

Atiku Abubakar of the opposition Peoples Democratic Party (PDP) got 131,716 votes.

The results were announced by the state returning officer Suleiman Bilbis.

Results at the state level need to be certified and announced by the Independent National Electoral Commission (Inec) chairman.

Read more:

• Who is Rabiu Kwankwaso of the NNPP?

Yemisi Adegoke
BBC News, Lagos

Ruling party candidate Bola Ahmed Tinubu is leading Nigeria’s most hotly contested general election since the country's return to democracy over two decades ago.

Fourteen of the 36 states have thus far been officially declared by the Independent National Electoral Commission (Inec).

Mr Tinubu has now secured 44% of the votes counted so far.

The main opposition candidate Atiku Abubakar is trailing in second, followed by Labour's Peter Obi.

In order to win the presidency, a candidate needs to have the most votes overall and win 25% in 25 of Nigeria’s 36 states.

But the electoral process has been mired in controversy.

Late on Monday, both of the main opposition parties walked out of the national collation centre in the capital, Abuja, where results were being announced.

They accused the electoral body of a lack of transparency around a new electronic voter system, a claim the commission denies.

European Union observers said the electoral body's poor planning and communication undermined trust in the process.

The polls have also seen major upsets. Mr Tinubu was defeated in Lagos, his stronghold for over two decades, by a surprise third party candidate Peter Obi who has galvanised support among Nigeria's youth.

Mr Abubakar, Mr Tinubu's main rival, won Katsina, the home state of outgoing President Muhammadu Buhari who is supporting Mr Tinubu.

Nigeria's new president will face a myriad of problems including worsening insecurity, rising unemployment and a failing economy

Image source, Getty Images

Nigeria's Independent National Electoral Commission (Inec) has so far announced the results of 14 states.

The winners in each state are as follows:

Bola Tinubu:

• Kwara state
• Oyo state
• Ogun state
• Ekiti state
• Ondo state
• Jigawa state

Atiku Abubakar

• Osun state
• Adamawa state
• Gombe state
• Yobe state
• Katsina state

Peter Obi:

• Lagos state
• Enugu state
• Nasarawa state

To win in the first round, a candidate must have the largest number of votes nationwide and at least 25% of the votes in two-thirds of the 36 states and the Federal Capital Territory

Image source, Getty Images

A European Union observer mission has faulted the lack of transparency and operational failures in the Nigerian election, according to its preliminary findings.

It said there was confidence in the independence and professionalism of the electoral body during preparations for the elections.

But public trust waned over lack of efficient planning and effective communication in the process - including on the election day, the observers said.

Nigerians cast their votes in a presidential and parliamentary general election on Saturday.

The observers noted that some poll centres opened late and polling procedures were not always followed.

They said the uploading of the results using an electronic system did not work, raising concerns as transmission of presidential election results forms was delayed.

The observer team has urged stakeholders in the election to uphold peace until the process is completed and called for any disputes arising to be addressed through legal channels.

Image source, AFP

Former Nigerian President Olusegun Obasanjo has urged the country’s electoral body to save the country from “a looming danger” over what he described as corruption of the electoral process.

In a statement, he said tension was building up and asked President Muhammadu Buhari to “let all elections that do not pass the credibility and transparency test be cancelled”.

He said the Independent National Electoral Commission's (Inec) decision to revert to manual transmission of results was deliberate despite investing on an electronic system that would allow immediate transmission of results from polling units.

“It is no secret that Inec officials, at the operational level, have been allegedly compromised to make what should have worked not to work and to revert to the manual transmission of results which is manipulated and the results doctored,” he said.

The retired president also appealed to citizens to be patient and expressed confidence in the “system working right”.

“I strongly believe that nobody will toy with the future and fortune of Nigeria at this juncture,” he said.

Labour's Peter Obi has narrowly won the presidential election in Nasarawa state, according to official results.

Mr Obi got 191,361 votes, while the ruling party's Bola Tinubu got 172,922 votes.

Opposition candidate Atiku Abubakar got 147,093 votes.

Nigeria's ruling party candidate Bola Tinubu has won the presidential election in the north-western Jigawa state, official results show.

He got 421,390 votes while his nearest rival, Atiku Abubakar, got 386,587.

Labour's Peter Obi got 1,889.

The results were announced on Monday night at the national collation centre in the capital, Abuja.

Good morning and welcome to the BBC's live coverage of Nigeria's tightly contested presidential election, as more results come in from states around the country.

The ruling party candidate takes an early lead in presidential results despite losing in Lagos.

Image source, Getty Images

We're pausing our coverage of results coming in from Nigeria's presidential election - billed as the tightest contest since military rule ended in 1999.

We'll be back on Tuesday morning, but you can follow the latest results - and all the drama around the election - on our website and dedicated results page.

Here are the main points from the results released so far:

• With about a third of the 36 states officially declared, the ruling party's Bola Tinubu has a strong lead
• Main opposition candidate Atiku Abubakar is in second spot, followed by Labour's Peter Obi
• Most of the results in so far are from Tinubu strongholds so it is too early to predict a winner
• The parties of Mr Abubakar and Mr Obi have walked out of the venue where results are being announced
• They allege the counting process lacks transparency, which the election commission rejects

• Mr Tinubu has accepted defeat in Lagos to Mr Obi, which is an upset to his camp

• Mr Abubakar caused an upset by winning Katsina, according to provisional results. This is the home state of outgoing President Muhammadu Buhari, who is backing Tinubu to win.

Official results show that Nigeria's main opposition candidate Atiku Abubakar has won in north-eastern Gombe state with 319,123 votes, followed by Bola Tinubu of the APC with 146,977 and Peter Obi of Labour with 26,160 votes.

Nduka Orjinmo
BBC News, Abuja

Image source, Getty Images

Provisional results from Nigeria's presidential election show that the ruling party has been defeated in Katsina, the home state of outgoing President Muhammadu Buhari, by the opposition's Atiku Abubakar.

This is either an indication of disillusionment with Mr Buhari's eight-year tenure or his cult-like following hasn’t rubbed off on his All Progressives Congress (APC) party, and its candidate Bola Tinubu.

Katsina is one of the states battered by insecurity in Nigeria, with many communities ransacked by armed men locally referred to as bandits.

When I visited in December, many people in parts of the state were displeased with the direction in which the country was heading and were apathetic towards the elections. That less than a third of eligible voters cast their ballots in Katsina shows how unsatisfied many people are.

Official results announced by Nigeria's election commission confirm that the Labour candidate, Peter Obi, has won in Lagos state with 582,454 votes.

He was trailed by the APC's Bola Tinubu, who got 572,606 votes.

As we reported earlier, this result is a blow for the Tinubu camp, given that Mr Tinubu is regarded as a powerful figure in Lagos, having previously served as its governor.

The PDP's Atiku Abubakar came third, with 75,750 votes.

Observers from the Commonwealth have released a statement describing Nigeria's election as “largely peaceful”.

The chairperson of the Commonwealth Observer Group, and former South African President, Thabo Mbeki, said people were largely accorded their constitutional right to vote.

“We congratulate all Nigerians for their determination, patience and resilience displayed throughout the electoral process," Mr Mbeki said.

However, he did highlight challenges - namely some polling units being ill-equipped with sufficient lighting, and recommended the electoral commission sets up a post-election review.

He also said those who had grievances about the election should express their complaints through available legal channels.

Commonwealth observers were in Benue, Edo, Kano, Lagos, Ondo, Rivers and Sokoto states as well as the Federal Capital Territory (Abuja).

The body will leave on 2 March, when the observers will submit a full report.

The presidential candidate for the Labour Party, Peter Obi, has won by a landslide in the south-eastern Enugu state.

He gained 428,640 votes compared to 4,772 for the ruling APC's Bola Tinubu and 15,749 for the opposition PDP's Atiku Abubakar.

This is the first officially announced victory for Mr Obi, who is seeking to disrupt the traditional two-party domination of the APC and PDP.

Joshua Ajayi
BBC News, Abuja

The agents of the main opposition party, the Peoples Democratic Party (PDP), and the Labour Party, have walked out of the National Collation Centre, where official election results are being announced.

Dino Melaye of the PDP alleged that the electoral commission, Inec, had been compromised by the ruling All Progressives Congress party (APC): "We have evidence of Bvas machines malfunctioning in several states and we have asked the commission to provide us the state results on its portal as promised but they declined," he said.

Inec chairman Mahmood Yakubu said he had full confidence in the results being presented by the returning officers from the states and would continue with the announcements.