His boss, Deputy Chief Justice Philomena Mwilu, is one of seven judges who will decide on Wednesday whether the poll should take place on Thursday, two months after the previous vote was annulled. The bodyguard was shot in the shoulder and his gun was taken as he was buying pots of flowers by the side of the road, Mohamed said.
Kenya's Supreme Court is still hearing several cases challenging the legality of Thursday's election.
The main opposition candidate Raila Odinga is boycotting what he calls a "sham election... which will not represent the will of the people".
In the western city of Kisumu, around 2,000 demonstrators marched on the election board offices.More news: CM slams BJP's opposition to 'Mersal'
The government has declared Wednesday, October 25 a public holiday.
Those asking the Supreme Court to delay the election said in their written arguments Ms Akombe's comments showed the electoral commission was unable to conduct a credible vote.
While dismissing the petition filed by Pokot South Member of Parliament David Pkosing, Justice Chacha Mwita on Tuesday ruled that issues raised by the petitioner can only be heard Supreme Court.
Human rights activist Khelef Khalifa, one of the petitioners, said Tuesday that the Supreme Court judgment nullifying President Uhuru Kenyatta's August re-election stated that the fresh election must be credible and verifiable.More news: Antonio Conte hails Chelsea's spirit, commitment in Watford win
IEBC commissioners, they argue, are serving partisan interests and Chairman Wafula Chebukati has publicly admitted that he can not guarantee credible election.
According to the judge, IEBC has done what the Supreme Court directed them to do and if there's a contempt of court by the NASA principals - who withdrew from the election - the Supreme Court can deal with the matter. "We have not told people to protest on polling day".
They said that the credibility of the vote is not assured, citing political interference among other concerns.
A police officer told The Associated Press that he and his colleagues were firing blanks.More news: Sri Lanka president keen to beef up ties with Pakistan
That ruling was the first time a court in Africa had overturned a presidential election, and it drew global praise as an affirmation of judicial independence.