NTV videographer Winnie Chepkemoi, who was covering the events, said one of the officers slapped her and injured her left arm, demanding to know why she was recording footage.
Ms Chepkemoi’s colleague intervened whereas the MP’s supporters reprimanded the policeman. A senior officer threatened to have journalists at the scene locked up.
A police officer assaulted a Nation Media Group journalist during Emurua Dikirr MP Johana Ng’eno’s dramatic return home from the police cells on Friday.
The MP was arrested on September 7 after issuing remarks about President Uhuru Kenyatta and the Mau Forest at a public gathering.