The explosion is the latest in a string of attacks in Kenya’s restive border regions with Somalia, where Kenyan troops are fighting Islamist insurgents.
“The explosion occurred on the roadside where the officers were patrolling,” a police source in the town said. “One died on the spot while the two others have been taken to hospital.”
Kenya has suffered a series of bomb blasts and shootings since sending soldiers into Somalia to fight Al-Qaeda-linked Shabaab insurgents in October 2011.
The violence has been blamed on the insurgents or their Kenyan supporters, although no attacks have been claimed by the Shabaab.