The new First Lady of Nigeria has hailed a "triumphant show of democracy" after her husband and opposition leader Muhammadu Buhari won the country's election.
All Progressives Congress leader Buhari, who said he had been "converted" to democracy after first seizing power three decades ago in a military coup, is the first Nigerian to oust a sitting president through the ballot box.
His wife, Aisha Buhari, took to Twitter to share her joy as the results rolled in, saying she was "so proud" of her husband and his team.
I am excited for the future of this nation as We now have a mandate for Change.
We must see this as a triumphant show of democracy, a change for the better.
Nigerians are aware now more than ever that the people have the power to sway the fate of a nation.
Voters in Nigeria have taken to the streets waving banners and flags in celebration after the opposition All Progressives Congress took power after the country's general election.
APC leader Muhammadu Buhari claimed victory over President Goodluck Jonathan's People's Democratic Party in the election - the first time in the country's history that a sitting government has been ousted in a purely democratic vote.
Celebrations spilled out into the streets as the election results poured in, with young men performing motorbike stunts and dancing as reports emerged claiming Jonathan had conceded defeat, allaying fears he might refuse to relinquish power.
Campaign groups have joined calls from broadcaster Al Jazeera to free two journalists detained at a hotel in Maiduguri after filming for a report on Islamist extremist group Boko Haram.
Ahmed Idris and producer Ali Mustafa - both Nigerian nationals - were working on a series of pieces ahead of the country's general election when they were detained in their hotel room on March 24.
Bosses at Al Jazeera say the coverage was arranged with the full cooperation of the Nigerian military, and say both men were fully accredited to film anywhere in the country during the election period.
But the military has accused them of "operating without protection, accreditation or due clearance", and of "loitering" in various locations.
The detention has been condemned by the Committee to Protect Journalists and the Nigeria Civil Society Situation Room.
Former Nigerian President Goodluck Jonathan has called opposition leader Muhammadu Buhari to congratulate him on his victory in the country's general election, according to a spokesman for the winning All Progressive's Congress party.
At about 5 minutes to 5, President Jonathan called General Muhammadu Buhari, the winner of the elections, to congratulate him.
I think he conceded defeat. There had always been this fear that he might not want to concede but he will remain a hero for this move.
The tension will go down dramatically.
Nigeria's opposition All Progressive's Congress has declared an "historic" election victory for the African nation, becoming the first party to overthrow the sitting government through a democratic vote.
With 35 of 36 states now declared, the APC had 15.1 million votes against 11.7m for the People's Democratic Party, whose leader and former president, Goodluck Jonathan, is now set be replaced by APC's former military leader Muhammadu Buhari.
APC spokesman Lai Mohammed said there was "no reason" to suspect that Jonathan would refuse to concede, after announcing before the election that he would relinquish power if he was voted out in a "free and fair election".
The run-up to the election period has been plagued with violence from Islamist extremist group Boko Haram, which saw a surge in membership during Jonathan's five years in charge.
But bar some technical glitches and a Boko Haram attack which left more than a dozen voters dead, the election has been been the smoothest in most orderly in recent history.
Boko Haram extremists have killed 39 people, including a legislator, in north-eastern Nigeria, disrupting the country's presidential election, officials said.
All the attacks took place in the north east where the military announced it had cleared the Islamic extremists from all major centres.
Residents of the town of Miringa said Boko Haram militants torched people's homes and then shot them as they tried to escape. Twenty five people reportedly died.
Witnesses and officials said another 14 people, including Gombe state legislator Umaru Ali, died later today in attacks on the towns of Biri and Dukku.
Nigeria have extended the voting period for their current elections until Sunday after reported technical issues at polling stations across the country.
Information Commissioner Chris Yimoga told journalists: "In polling units where accreditation was suspended to the following day, in accordance with the existing guidelines, arrangements will be made for voters to vote tomorrow."
State police commissioner Danladi Marcus has told Reuters by telephone that Islamist Boko Haram insurgents launched two deadly attacks on voters in northeast Nigeria on Saturday. The police and a security source said six people in an election in which insecurity is a major issue.
One attack was in Ngalda, Yobe state.
The other was in an ethnic Fulani village called Woru in Gombe state, a security source said.
In both attacks gunmen opened fire on voters as they trekked to their polling stations, killing three in each.
A car bomb has exploded at a polling station as people gathered to vote in the Presidential election in Nigeria's south-central Enugu state.
State Police Commissioner Dan Bature said an anti-bomb squad detonated two other cars filled with improvised explosive devises at the scene at a primary school.
There has been no claim of responsibility.
The explosions occurred far from north-eastern Nigeria, the centre of Boko Haram's Islamic uprising.
Pre-election violence has prompted election frontrunners President Goodluck Jonathan and former military dictator Muhammadu Buhari to sign a 'peace accord' on Thursday.
President Goodluck Jonathan is seeking a second four-year term as leader of Africa`s most populous nation against a strong challenge from the main opposition candidate Muhammadu Buhari.
The vote has been seen as a referendum on Jonathans record over the past four years, with an escalation in the Boko Haram insurgency and the continents top economy hit by the global shock in oil prices.
This is a great day for our son, and we are set to return him to power. He has done well. He deserves a second term.
Buhari, a former military ruler who has a reputation for fighting corruption, also charges that Jonathan has done little to tackle rampant graft in government, particularly in the oil and gas sector.
The election was postponed from February 14 because of military operations against Boko Haram in the northeast, which has since seen a series of claimed successes against the militants.