Eldoret police and the NCIC are looking for seven suspects involved in spreading hate speech through social media.
One was arrested and will be charged.
The suspects are members of the Uasin Gishu County Forum and the Uasin Gishu County residents WhatsApp groups.
County commissioner Abdi Hassan warned that those who incite residents to violence through the platforms will be arrested.
"Police have been adequately equipped to detect and deal with those involved in propagating hate speech," Hassan said.
The commissioner added lawlessness will not be allowed in the region as the country heads to next month's election.
"All speeches by politicians during the ongoing campaigns are being recorded for analysis to detect incitement," Hassan said.
He asked candidates to ensure they stick to the code of conduct they signed with the IEBC.
Uasin Gishu returning officer Jacktone Nyonje warned candidates that they risk disqualification and prosecution for contravening electoral laws.
Earlier on Monday, NCIC boss Francis Kaparo put WhatsApp administrators on notice saying they will be held to account for fueling violence.
He said the commission is monitoring groups to deal with "terrible people on social media who aim to cause unnecessary tension in the country".
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