Embakasi MP David Mwenje will be charged in a Nairobi court today with incitement to violence.
He is being held at the Jomo Kenyatta International Airport police station, according to Starehe MP Maina Kamanda.
A copy of the charge sheet says that on August 20 last year at Maili Saba, Dandora in Nairobi, he said; ''You cannot be defeated by Mwengenye group who number 500 people while you are 7,000 people. I can afford to buy you weapons including guns."
The words were intended to incite members of the public to violence, the charge says.
The charge sheet was signed by the Criminal Investigations Department of Buru Buru and witnessed by Mr Sammy Kimwele Mwagangi.
Mr Mwenje and 31 other people were arrested on Wednesday following the massacre at Kariobangi on Sunday night that left 21 people dead.
Mungiki sect leader Ndura Waruinge and Taliban vigilante group head David Peter Ochieng are among those held.
Mr Mwenje was first taken to Buru Buru police station and then transferred for an hour to Kasarani.
By last night he was still held at the airport, Mr Kamanda said.