Kenya's opposition Nasa presidential candidate Raila Odinga has rejected the elections results, claiming the electoral commission's IT system has been hacked.
Mr Odinga said the hackers used the identity of the late Independent Electoral and Boundaries Commission (IEBC) ICT manager Chris Msando to log into the system and manipulate the polls results in favour of the ruling Jubilee Party.
"We are telling our people not to accept results, stay calm as we get deep into this," Mr Odinga told a press conference on Wednesday.
According to results from the IEBC, President Uhuru Kenyatta was leading with 54.4 per cent of the vote against Mr Odinga's 44.7 per cent, a margin of about 1.4 million votes. The IEBC has tallied 167 of 291 constituencies.
Mr Odinga said the results posted by the polling agency on the presidential election were "fraud".
He said hackers introduced algorithms that would interfere with the streaming of results to the IEBC database.
"This attack on our democracy affected election results in all 47 counties," Mr Odinga said.
"Uhuru must go home, IEBC must be fully accountable," he added.