A controlled bomb hit and killed at least two General Service Unit officers Monday morning in Dadaab, Garissa County.
Four other officers were seriously injured in the attack, police said.
Police said the attack took place at Ege Dam along Dadaab-Garissa road when the officers were headed to provide security during the ongoing national exams.
The vehicle was badly damaged in the morning attack.
The injured were rushed to hospital and admitted.
A search was conducted in the area in vain.
The incident was anticipated as the terrorists had been sighted in the area
It came days after multi-agency teams at the weekend destroyed a logistics base used by al Shabaab militants in Dahun in Fafi, Garissa county, and recovered assorted foodstuffs.
The operation recovered rice, sugar, and water.
The officers destroyed the food and continued to pursue the terrorists who were using the base.
Police said by the time the team arrived there the terrorists had escaped.
This is the latest such recovery to be made in the same area in two weeks.
There are fears of more attacks in the area.
Police say the area is being used as a logistics base for the terrorists who move to attack targets and retreat there.
At least three al Shabaab militants were on October 17 neutralized in an ambush by police in Fafi, Garissa County, and assorted food was found on them.
They were transporting the food on donkey carts to a new makeshift when they were ambushed, police said.
The security team killed three militants while others escaped with serious injuries and recovered foodstuffs, water, and a collapsible tank, said a police official aware of the operation.
The area is near the Kenya Somalia border which is usually breached by the terrorists.
This has forced the government to suspend the planned opening of the border.
The al Shabaab terrorists are behind the attacks.
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