At least three people have been killed and others injured after twin explosions in Kenya’s port city of Mombasa.

All the casualties occurred when one or several grenades were thrown at a packed bus, arriving at a transport terminal from the capital Nairobi.

No one was hurt in the other blast, reportedly at a bar near a hotel popular with tourists along the Indian Ocean coastline.

There has been no claim of responsibility for the explosions.

But Kenya has blamed a surge in attacks on Somali Islamist militants who killed at least 67 people at a shopping mall in Nairobi last September.

The latest bloodshed comes after six worshippers were killed in an attack on a church near Mombasa in March.

The insurgents vowed to target Kenya after it sent troops into neighbouring Somalia to fight al Qaeda-linked militants in 2011.