• The legislator was grilled and ordered to return on Friday for further questioning
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Mavoko MP Patrick Makau was Thursday arrested in investigations over anti-government protests on Mombasa Road, Nairobi.
Makau was arrested Thursday at his home in Karen, Nairobi, police said.
Police raided his house at 4am and picked him up.
Detectives from 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 with what charges, if any.
He was however released hours after he had been grilled and ordered to return on Friday for further grilling.
He has denied any involvement in Wednesday's demonstrations, during which a section of the Expressway was damaged at the Mlolongo toll station, affecting traffic flow.
Makau's arrest was in connection with demonstrations during the anti-government protests called by the opposition to picket against the high cost of living.
This came amid reports there are plans to target a number of leaders for arrest over the protests.
Questions are being raised as to how police were overwhelmed, especially on the Expressway in Nairobi, amid claims the attackers on the property were facilitated.
The Expressway is manned by dozens of armed police officers all the time.
But when goons raided the property in Mlolongo, the officers were nowhere to be seen.
Responding teams, which arrived almost two hours after property had been vandalised, shot and killed four people as part of efforts to restore order.
Police say some of the protests were spontaneous and happened in at least 30 counties.
Interior CS Prof Kithure Kindiki said persons who participated in the demonstrations, both directly and indirectly, will be dealt with in accordance with the law.
At least nine people were killed in the protests, including four in Mlolongo, two in Kitengela, one in Nairobi and one in Emali in Makueni county.
The issue is being investigated.