The bodyguard of a member of Kenya's Supreme Court was shot and injured on the eve of its judgment about whether to suspend a controversial presidential election.
Odinga, who has since the Kenya apex court nullified the initial election result and ordered for a re-run, continued to rally his supporters with the slogan "No reforms, No elections", is contending that the country's authorities had failed to reform the body which conducted the August's poll.
In the western city of Kisumu, around 2,000 demonstrators marched on the election board offices, witnesses said, responding to Raila Odinga's appeal for protests against Thursday's repeat presidential ballot. Njoroge said one person shouted "finish him" and they shot him in the mouth and twice in the chest before fleeing with the officer's gun.
Kenyatta officially won the first election on August 8, by 1.4 million votes, but the Supreme Court annulled that outcome on September 1 over procedural irregularities.More news: Egypt: Hasm militants kill dozens of police after botched raid
There are fears that if the election goes ahead - with the incumbent president Uhuru Kenyatta as the only remaining candidate - there will be widespread violence.
The court hearing will occur even though Kenya's interior ministry has declared Wednesday and Thursday to be public holidays.
The three petitioners, represented by lawyer Harun Ndubi, also want the court to interpret the meaning of Raila Odinga's withdrawal from the election.
Another electoral commissioner, Roselyn Akombe, resigned, saying free and fair elections were not possible.More news: Virginia Polls Show Northam's lead in Governor Race
One key case, brought by human rights activist Khelef Khalifa and two others, seeks to delay the vote on grounds that the election board is not sufficiently prepared.
Tensions have been mounting in the East African country ahead of the poll rerun, with nearly daily mass protests and foreign diplomats warning a fair election can not be guaranteed.
Ahead of the planned vote on Thursday, the European Union said it would have a reduced number of election observers, citing the tense political environment and concerns about the safety of its monitors.More news: ACLU Slams Houston Suburb for Withholding Hurricane Relief to Anyone Boycotting Israel