Kenyan media and police have said that two buses driving along a busy highway in the Kenyan capital Nairobi were struck by explosive devices thrown at them.
As yet there has been no word on casualties and no immediate claim of responsibility but Kenya has blamed similar attacks on the al Qaeda-linked Somali group al Shabaab, which killed at least 67 people at the Westgate shopping mall in Nairobi last September.
Four people were killed on Saturday when attackers threw an explosive device at passengers at a bus station in Mombasa, and also targeted a luxury hotel in the coastal city.
More top news
More than 50 dog surfers of all breeds and sizes joined an annual dog surfing competition in California
A painting by artist LS Lowry is to go on show to the public for the first time.
A third of Olympic and world championships medals have been won by athletes with allegedly suspicious doping test results, report claims