No one has claimed responsibility for the attacks - the most recent of which was an explosion on a Nairobi bus that killed four people Saturday - and there have been no arrests.
Kenya has been the target of sustained attacks since the army sent troops into neighbouring Somalia to fight the country's Al-Qaeda-linked Shebab insurgents in October 2011.
Eastern Kenya, along the 700-kilometre border with Somalia, has been particularly hard hit.
Late Friday, one person was killed and three injured in a double explosion at a market in the town of Wajir, some 100 kilometres from the Somali border.
On Tuesday, eight people were killed, including five policeman, in the Garissa region some 20 kilometres from the Somalian frontier after their vehicle was attacked in an apparent ambush.
Another policeman is missing following the attack.
And Saturday's bus attack blew the vehicle apart, turning it into a mangled metal skeleton and sending shrapnel flying through the air. Four people died and 36 were wounded.
A grenade thrown at a minibus transporting British tourists hit a window, but did not explode. It was the first attack on tourists since 2011.
The British tourists were en route to the famous Masai Mara safari park.
In September 2011, British tourist David Tebbutt was killed as he fought kidnappers in a luxury tourist village on the Kenyan coast, not far from Somalia.
His wife, Judith, was captured and taken to Somalia, where she was freed after six months of captivity.
"Mombasa has been targeted, but it is true that this attack against tourists is a novelty," the Western observer noted.
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