Police in Kenya have arrested an aide to Deputy President William Ruto in an ongoing investigation over an alleged plot to assassinate the politician.

Dennis Itumbi – who is the secretary for digital in the presidency – was arrested in the Central Business District in the capital, Nairobi.

Mr Itumbi has been linked to a letter alleging a plot to kill Mr Ruto which local media, quoting investigators, say was fake.

He is currently being questioned at the Directorate of Criminal Investigations (DCI) headquarters on Kiambu Road.

The allegations led to three government ministers being summoned by the police for questioning.