The Ministry of Interior is on the spot over the award of tenders during the 2017/2018 financial year.
An audit report revealed that due process was not followed in the purchase of three helicopters in a Sh4.9 billion contract awarded to a foreign firm.
The helicopters for the Police Airwing were initially tendered at Sh4 billion (Euros 31,941,200), but the figure was later reviewed upwards to Sh4.9 billion (Euros 31,123,357).
Appearing before National Assembly Public Accounts Committee (PAC) on Tuesday, Interior Principal Secretary Karanja Kibicho said that the variation was as a result of errors during the tendering process.
Mr Kibicho said the over Sh900 million additional spending was due to extra specifications that were not initially provided. He said that the features were important for the safety of the aircraft.