President Uhuru Kenyatta has won re-election in Kenya, defeating veteran opposition leader and longtime rival Raila Odinga in a tense contest.
Kenya's election commission declared Friday that the 55-year-old businessman and son of the country's founding President had received enough votes to secure a second five-year term.
Provisional and unverified reporting following Tuesday's vote had given Kenyatta a wide margin of 54% to 45% with 98% of polling stations reporting.
He garnered 54.27% of the final vote; Odinga received 44.74%.
The nation's top elections official, Wafula Chebukati, said the vote was carried out in a "free, fair and credible manner."
Odinga, a 72-year-old former political prisoner who has campaigned for the presidency four times, is refusing to accept the results, claiming the vote was hacked.
Odinga, running as the opposition's National Super Alliance candidate, told CNN Thursday that he doesn't "trust" the paper forms from polling stations around the country that officials used to authenticate votes.
Odinga said the forms could have been "manipulated" before being returned to the capital. At a news conference Thursday, members of Odinga's party gave no evidence to support any claims of election tampering, citing only unnamed sources at the election commission.
In a letter released Friday morning, Wafula Chebukati, chairman of Kenya's Independent Electoral and Boundaries Commission (IEBC), rejected the opposition coalition's evidence of election fraud, calling it "obviously and plainly falsified."
On Thursday, Chebukati said tampering with the election system "was attempted but did not succeed," without elaborating further.
Earlier on Friday, international observers called upon candidates to respect the final outcome and resolve any poll disputes through legal avenues.
"It is a sign of leadership and public service to be able to congratulate your opponent with grace as a normal and important part of democracy," Marietje Schaake, head of the European Union's mission, said in a statement.
"And should there be a need to challenge any of the proceedings or outcomes, petitions through the courts are the avenue to take."
Over 400 international election monitors -- including officials from the United States and the EU -- were deployed across the country to monitor voting, the tallying process and part of the post-election period.
Former US secretary of State John Kerry, who served as an election observer for the Carter Center, said Thursday that while there were "little aberrations here and there," the election was not rigged.
"If anything was electronically fiddled with, there is a way to go back and absolutely ascertain what happened in the polling station," he said. "So by paper ballots, there is a protection of each and every Kenyan's vote."
Peaceful elections in East Africa's largest economy would help provide stability to the region but allegations of vote rigging have sparked concern with some Kenyans fearing ethnic clashes similar to those triggered a decade ago.
More than 1,000 died in months of violence and bloodshed after Odinga -- who had been defeated by the then-President Mwai Kibaki -- claimed the 2007 election had been rigged.
Odinga and his party repeatedly called for calm this week as the final results were compiled.
Extra security forces have been deployed to the streets of Kenya's capital, Nairobi, interior ministry spokesman Mwenda Njoka told CNN. Additional police have also been installed at the airport in the western city of Kisumu as a preventative measure, according to Reuters.
Nairobi remained quieter than usual after the national holiday on Tuesday. Some businesses were open in the city center but mostly people were remaining indoors; other residents who went to their home villages to vote might also have stayed away.
In Kisumu, a local journalist described the city center as "a ghost town."
At least two people died in election-related violence after brief protests broke out in several Odinga strongholds -- in Nairobi and Kisumu -- on Wednesday. The day before, a polling agent from Odinga's party was killed in a machete attack in Tana River county.
"We do not want to see any violence in Kenya. We know the consequences of what happened in 2008 and we don't want to see a repeat of that anymore," Odinga told CNN on Thursday.
"I don't control anybody. What is happening is that people just want to see justice. We also hope that the security forces are not going to use excessive force."