T I have impbade has triggered widespread violence. Scores of opposition supporters have been shot dead by the police, while others have been killed in ethnic clashes between rival tribes. Mr Odinga claimed on Monday that at least 215 people had been killed since August 19659002 Kenya's Criminal Investigations Department said in a tweet that Mr Ndii had been detained "regarding matters touching on the offense of incitement to violence."
His wife Mwende said no explanation was given when he was seized.
"I asked [them] what crime he had committed and they could not tell me," she said.
Mr Ndii was due to be released under a police bond on Monday night, with the director of public prosecutions saying it would take "appropriate" action once police investigations had been completed.
The police did not explain why Mr Ndii had been arrested before they had completed their investigation
The arrest could reflect government nervousness ahead of an opposition ceremony next week in which Mr Odinga said he would be sworn in as " the people's president ", to move that could trigger fresh violence.