A bomb attack at a bus station near the centre of Nairobi killed at least three people and wounded more than 20 others on Saturday, Kenya police said.
A senior police official who did not want to be named told AFP it was believed that one or several grenades had been thrown at the bus station.
It is the first such incident in the Kenyan capital since two grenade attacks carried out within 24 hours of each other late last October killed one person and injured 30 others.
A Kenyan supporter of Somalia’s Islamist Shebab fighters was arrested soon afterwards and was convicted after having confessed to the attacks.
The Shebab have on several occasions threatened reprisal attacks against Kenya since it sent its troops over the border into southern Somalia in mid-October to fight the group.
No one has so far claimed responsibility for Saturday’s attacks.
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