DCI detectives are currently questioning Pokot South MP David Pkosing in regards bandit threat in the area.
The member of parliament was detained as he was leaving his KICC office on Thursday evening.
In support of Pkosing, other West Pokot MPs made their way to the DCI offices on Kiambu Road.
Senator Julius Murgor, Woman Representative Rael Leotum, North Pokot MP Titus Lotee, and Kapenguria MP Samuel Moroto are among them.
In six hotspot counties where a joint security operation involving the police and military has been ordered, the government has formally declared total war on banditry.
More than 100 citizens and 16 police officers have been ruthlessly slain by marauding bandits and cattle rustlers in the Northern Rift Valley region within the last six months, Interior CS Kithure Kindiki announced on Sunday.
As a corrective and deterrent step, the CS imposed a 30-day dusk-to-dawn curfew in certain of the banditry-affected areas in the counties of Turkana, West Pokot, Elgeyo Marakwet, Baringo, Laikipia, and Samburu.
A three-day amnesty was also granted by the government for the voluntary surrender of all illicit firearms.