Sections of Bungoma county are tense after leaflets warning residents against taking part in Thursday poll were circulated.
The leaflets, believed to have been circulated on Sunday night, were spotted in Webuye, Kimilili, Bungoma and Chwele towns.
"There will be no voting on October 26...anyone who will be found trying to vote will be endangering their lives...be warned," they read.
"No reforms! No election! The servers must also be opened first."
Residents and business operators have said they are living in fear of possible attacks.
Bungoma police commander Charles Munyoli has assured residents of their total safety come the voting day.
He said the police, together with the intelligence and DCI teams, are investigating the source of the leaflets.
Munyoli has said that as police, they will ensure the safety of all the voters in all the nine constituencies.
"We shall net those behind the leaflets," he said on Monday adding that it is against the law for any person to threaten any citizen.
"Those found guilty will face the full wrath of the law. Everyone will be required to vote on Thursday. Those who wish not to should remain in their houses."
The police boss said one person was arrested in Chwele in regard to other leaflets that had been spread in the area.
He asked members of the public to come out openly and share information with the police over such offensive material.
Bungoma Jubilee leaders, led by former Kanduyi MP Alfred Khangati, condemned the act.
"We are calling upon the Inspector General of police Joseph Boinet to move with speed and arrest those behind the threats," he said.
Kellan Wabomba, a resident political activist, said that the leaflets have made residents live in fear.
"Adequate measures by security teams must be taken to arrest those behind the leaflets."