What you need to know:
A source involved in the raid said the Commission was investigating the governor following reports of alleged involvement in irregular payment of allowances and awarding of tenders.
The investigations also involve alleged allowances for fictitious foreign trips.
Officials from the Ethics and Anti-Corruption Commission (EACC) conducted a raid on Governor Anne Waiguru's rural home at Kagio village, Kirinyaga County.
The officers went to her home at 6am on Thursday and ransacked it for hours, in search of crucial accounts documents.
They made a surprise entry into the posh home in Kagio area, while a similar search was also conducted at Ms Waiguru's two homes in Nairobi.
EACC Central region manager Charles Rasugu confirmed to the Nation that the agency had conducted the raid and interrogated staff at the Kirinyaga County Government offices.
The anti-graft watchdog said it is investigating allegations that Governor Waiguru and other county staff were irregularly paid travel allowances amounting to Sh23 million, money reportedly spent on non-existent trips.
The Commission wants to establish whether the trips were actually taken and whether the documents supporting disbursement of Sh23 million to county officials are genuine.
The Nyeri Chief Magistrate Court had issued search warrants against the county boss and other staff with a view to retrieving information that may be useful to EACC's investigation.
EACC officers were seen carting away computers from Ms Waiguru's offices at Kutus sub-county headquarters.