The opposition has vowed to continue with its daily protests next week and to push for the dismissal of 12 election commission officials accused of rigging the vote on August 8.
National Super Alliance (Nasa) supporters held pro-Raila Odinga protests outside the UK Parliament.
It also still remains unclear what Raila and his cronies exactly mean when they say that there shall be no election on October 26.
Several were treated for gunshot wounds on Wednesday in Kisumu, according to a doctor at the local hospital.
But Odinga withdrew from the race this week, saying the election board had failed to institute reforms to ensure a free and fair election.More news: $10 million reward for 'dirt' on Donald Trump
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In capital Nairobi, baton-wielding police rained blows at protesters who were caught off-guard; traffic was brought to a standstill in major areas across the city with many businesses remaining closed in fear of vandalism and looting.
The Jaramogi Oginga Odinga hospital in Kisumu, named after Odinga's father, said it had admitted 20 patients injured in the demonstrations. Kenya's Supreme Court last month annulled the August election citing widespread irregularities in the counting process and mismanagement by election officials, and called for a re-run within 60 days. Odinga demanded deep reforms that the election commission (IEBC) said were impossible to deliver in the constitutionally mandated period.
"If it goes ahead it is not an election, it is a selection", Odinga told Reuters in an interview during a visit to London. That judgement stated that if a candidate dies or withdraws from the fresh election, the IEBC must begin presidential nominations from scratch.
Odinga has argued that his withdrawal from the race forces the IEBC to cancel the election and begin the whole process from scratch - allowing more time for his reforms. "One thing is for sure, the country is entering uncharted waters and walking the path to the unknown", the Daily Nation said in an editorial. "We condemn the directive. on the limitation of our rights to demonstrate". Since then a series of demonstrations have seen police teargas protesters, who in some cases have grown violent, with no deaths recorded.
The rapidly declining situation is reminiscent of the disputed 2007 elections, which led to some 1,400 were being killed.