Two AP officers were killed on Thursday morning after their vehicle ran over an IED at Malelei in Kulan area, Garissa county.
Northeastern regional coordinator Mohamud Saleh said this was the number of people killed and that two others were injured.
Saleh said one person was in critical condition and that the vehicle belonged to the immigration department.
But via Twitter, Kenya Red Cross Society said five people were killed and five injured. The society said it responded to the incident.
The attack came a day after three police officers including an inspector were killed in an IED attack in the county.
Saleh said the officers were on patrol in Kulan area when their vehicle hit a landmine at 6.30am.
Three other officers injured in the attackwere flown to Nairobi for specialised treatment.
In February, three people were hit with blunt objects on their heads and killed while they slept at a hotel in the town.
The two waiters and a private security guard were attacked by unknown people at about 3 am.
On April 2, 2015, four terrorists stormed Garissa University College and shot indiscriminately at students and security personnel.
Within an hour of the dawn attack, the militants had killed about 100 people.