At least six people were killed and over 30 others injured when a grenade was thrown into a crowded vehicle in the Eastleigh area, police said, ripping the roof and sides off the bus.

Kalonzo called for calm amongst locals following retaliatory attacks against ethic Somalis near the scene of the blast.

“The terrorists’ intention is to cause friction between Christians and Muslims but we believe in our security agencies. I urge for calm,” said Musyoka.

A number of recent attacks in Nairobi and Mombasa have been blamed on Somalia’s Al-Shabaab militant group which vowed to revenge after Kenyan troops crossed the border in to Somalia in October last year.