File photo taken on Aug. 8, 2017 shows presidential candidate of Kenya's Jubille Party Uhuru Kenyatta casting his ballot at a polling station in Gatundu, Kiambu County, Kenya. Uhuru Kenyatta won Kenya's Presidential election on Aug. 11, according to the poll body. (Xinhua/Lyu Shuai)

NAIROBI, Aug. 11 (Xinhua) -- Kenyan President Uhuru Kenyatta was on Friday declared the winner of Tuesday's presidential elections with 8.20 million (54.27 percent) votes against 6.76 million (44.74 percent) for his main challenger, Raila Odinga after a tense electoral process which was preceded by an opposition walkout.

"I therefore declare Hon. Uhuru Kenyatta as the president-elect and Hon. William Ruto as deputy-president elect," the Independent Electoral and Boundaries Commission (IEBC) Chairman Wafula Chebukati said.

President Kenyatta won the vote out of a total of 15.04 million voters who took part in the polls, according to Chebukati.

"We committed ourselves to ensure these elections were conducted in a free and fair manner," said Chebukati at the event which was boycotted by the opposition.

"We are confident the manner these elections were conducted elevates Kenya to join the ranks of mature democracies," he said.

The opposition National Super Alliance (NASA) leaders had earlier said the electoral body had ignored its complaints and have also ruled out filing a petition in the Supreme Court to challenge the outcome.

At least 19.6 million voters were registered for the elections.