Demonstraters who were dispersed by police earlier on Sunday have condemned the move saying they were agitating for peace ahead of Monday's planned mass action.
Six people were injured in the ensuing melee when supporters of Azimio leader Raila Odinga pelted the group with stones forcing them to run for their safety.
Area police arrived at the scene and helped bring the situation under control.
Raila's supporters said those holding peaceful demonstrations were opposing the planned Monday mass action.
But human rights defender Erick Okelo termed the attack as unfortunate and called on police to investigate those behind the incident.
"Our procession was not political but to champion for peace amongst our youths," he said.
Okelo said the protesters were only promoting peace in the region for the sake of development and well being of the people.
He said they acted within the precincts of the Constitution which guarantees the right to peaceful picketing.
Wilson Aminda, one of the demonstrators, said they were championing for peace and not violence.
He added that the attack on them was unwarranted and should be probed effectively by security agencies.
He called on leaders who he alleged sponsored youths to attack them to join them on Monday during the planned demonstration by Azimio.
While addressing a press conference in Kisumu after the attacks, Aminda said leaders should not use Kenyans for their selfish gains.
He said leaders should not misuse youth while their children and relatives are safe at home.
"We are appealing to our fellow youths to shun mass action which will derail the development projects in Kisumu. The demonstrations will also scare away potential investors capable of investing to create jobs for unemployed youths."
Aminda said the leaders pushing for the lowering of cost of life are the same leaders who worked with the Jubilee government under retired President Uhuru Kenyatta at a time the cost of living started going up.
He pointed out that the Kisumu business community was part of the peaceful demonstration that was aimed at safeguarding their businesses during Monday's demonstrations.
Former councilor George Ondere asked Azimio leader Raila Odinga to accept the outcome of the election for the sake of peace and unity in the country.
"I'm humbly appealing to Baba (Raila) to embrace peace. It would be bad if every general elections there is violence and death and loss of property."
