Kajiado security officials have ordered investigations into hate leaflets circulated in Ngong town on Saturday night.
County Commissioner Harsama Kello, while condemning the incident, said the government is seriously following the matter.
The leaflets warn the Kikuyu, Kisii, Kalenjin, and Meru to leave the county immediately further warning them of dire consequences on August 8.
They were circulated in the region after President Uhuru Kenyatta accused opposition leader Raila Odinga of hate speech.
Uhuru cautioned his main opponent in the election against attempts to incite the Maasai against other communities living in the county.
"Our officers are on the ground investigating the source of those leaflets. We will close in on the perpetrators," Kello said.
He said the situation threatens the cohesion among the various tribes living in Kajiado.
"Let this be a warning to everyone attempting to divide Kenyans that we will arrest them regardless of their positions in the society."
While in Maili 46 town on Tuesday, Raila said the Maasai people have been driven by poverty to sell their land to 'outsiders'.
The ODM leader said he will improve living conditions of Kenyans so that they don't have to dispose of their property.
Raila told those salivating over the Maasai land to go back to their counties and get land.
Politicians from both sides of the divide have seized of the matter as each tries to explain the statement which Raila says was misinterpreted.
Secretary General Raphael Tuju said at a press conference Friday that the former Prime Minister’s utterances should be treated as “irresponsible and inflammatory”.
The NASA presidential flag bearer denied uttering comments bordering on hate speech against the non-Maasai people living in Kajiado.