Azimio la Umoja leader Raila Odinga is on his way to the Directorate of Criminal Investigations headquarters.
Raila will join a host of former CS and leaders who are at the sleuths headquarters in solidarity with the former Interior CS.
He will head straight to the Kiambu road-based offices from parliament where he had gone to collect his dividends.
Matiang'i presented himself at the DCI offices on Tuesday after he received a summons on Monday.
Matiang'i arrived in the company of lawyers and went into an interrogation room where four senior officers from the Crime Research and Intelligence Bureau were waiting.
By mid-day, there were no signs of them getting out amid reports there were plans to charge Matiang'i.
