A police officer was killed on Thursday after an explosive hidden in a donkey cart exploded in Mandera.
Police say two other officers were injured during the incident as two donkeys were crossing with luggage from Somalia side with a guide.
Security agents manning the border had stopped donkey cart for a routine inspection for contraband items when the bomb went off.
However, the donkeys survived the explosion.
It is thought that suspected members of the terrorist group Al-Shabaab, which is associated with Al-Qaeda, may have remotely detonated the explosives.
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One of the northern counties that has been hardest hit by terrorist assaults is Mandera, which borders Somalia.
Other counties that have come under Al-Shabaab attacks including the neighboring Garissa and Wajir Counties.
