Detectives from the Ethics and Anti-Corruption Commission (EACC) has arrested Kiambu Governor Ferdinand Waititu following corruption claims in his government.
Waititu was arrested after more than six hours of interrogation and search at his Runda home.
The crime busters raided the residence a few minutes after 5am and started a search for files and documents.
The officers camped at his home until noon when they arrested the county boss, restraining him from leaving for work.
Waititu was later taken to Integrity Centre, the operations nerve centre of the EACC.
The detectives carted away files and records relating to contracts issued by Mr Waititu’s administration.
They also confiscated and carried away some number plates which were found in the boot of his Toyota Prado.
Neither Mr Waititu not EACC detectives addressed a battery of journalists who camped outside the besieged home as the raid went on.
The outspoken governor, popularly known as Baba Yao, is under the EACC spotlight over alleged corruption in a number of his county programmes, including Kaa Sober, which was aimed at rehabilitating alcoholics.
The arrest comes hours after the Kiambu County Assembly rushed and passed a supplementary budget in which it approved an expenditure of Sh722 million under the controversial programme.
The passing of the budget was widely seen as a scheme to regularise the controversial expenditure in which millions of shillings are suspected to have been stolen.
Sources told the Nation that 15 other officials of the county government are targeted in the ongoing investigations.
This week, some of the county officials appeared before the EACC over the matter.