Three Kenyan soldiers in plainclothes were shot dead by assailants in Garissa on Monday while changing a flat tyre at a car garage.
The attack on the soldiers came a day after a bomb was thrown at a moving vehicle in Nairobi killing 10 people.
And the British High Commission in Nairobi on Monday advised its citizens to exercise extreme caution and avoid any gatherings in Eastleigh.
" On Sunday 18 November 2012 a grenade was thrown at a bus near to St Teresa’s church on First Avenue in Eastleigh, Nairobi. Casualties have been reported.
The attack has been followed by violent clashes. You should exercise extreme caution and avoid any gatherings in this area," the high commission advised its citizens.