At least two university staff were shot dead by suspected Al-Shabaab militants in the coastal town of Kwale on Tuesday.
Regional police commander Larry Kieng said the assailants sprayed a private car with the bullets, killing the two from the Technical University of Mombasa on the spot.
Two police officers who were in the car were also injured and rushed to hospital in critical condition. The officers were escorting the staff when they were ambushed by the assailants, Kieng told Xinhua.
He said a team of security officers were mobilized and are hunting down the gunmen suspected to be Al-Shabaab returnees.
Kieng said the injured police officers managed to repulse the motorbike-riding attackers who had targeted to rob their rifles.
The police commander did not rule out terrorism. Police believe the suspects were behind the killing of two police officers on Sept. 3 in Kwale.
The officers were killed in an attack at a local church in Ukunda and their rifles were taken by gunmen.