Mavoko Member of Parliament Patrick Makau was Thursday arrested and released in investigations over anti-government protests witnessed along Mombasa Road, Nairobi.
Makau was arrested on Thursday at his home in Karen, Nairobi, police said.
Police raided his house at 4 am and picked him up.
Detectives from the Directorate of Criminal Investigations (DCI) took him to the directorate's offices in Nairobi Area for questioning.
It is not clear if and when he will be arraigned and what charges will be preferred against him.
He was, however, released hours after he had been grilled and ordered to return there on Friday, July 14 for further grilling.
He has denied any involvement in the demonstrations that were witnessed on Wednesday where a section of the Expressway was damaged affecting traffic flow.