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.
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"People must be aware at all times that there are wild animals around them and they must make sure that their tents are properly closed."