The attack came just hours before a wave of grenade attacks blamed on al-Qaeda-linked Islamists hit Mogadishu, Somalia's capital, killing a young boy as he watched the England-Sweden football game on television with his father.
Jihadists sympathetic to al-Shabaab, Somalia's Islamist insurgents, were suspected of organising the first attack, at Kenya's Dadaab refugee camp.
The first of eight vehicles in a convoy - a Kenya Police four-wheel-drive - was hit as it escorted aid workers from the camp back to their accommodation.
Two of the four men were seriously wounded. Two men, refugees from Somalia, were arrested over the bombing late on Tuesday.
At least five grenades were later detonated in different parts of Mogadishu in coordinated attacks apparenly designed to show Somalia's Western-backed government that it was not yet free of al-Shabaab strikes in the capital.
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African Union peacekeepers had claimed that they had pushed the militants out of the city a month ago. "We are still confused about the meaning of this attack," said Daud Hussein, the owner of the house in the Seypiano district of the city, where the boy was killed. "Everybody was excited to be watching the game, and no one expected that such a horrible incident was about to happen," said Mohamed Black, a second witness to the Tuesday evening attack.
"I'm lucky to survive but a friend of mine was among the injured."
The strikes came as Raila Odinga, Kenya's prime minister, announced that Israel would provide unspecified "support" for his government's now month-long offensive inside Somalia. Al-Shabaab's leaders promised to retaliate and called on Muslims around the world to unite to support the campaign against "the Kenyan Christians" and "the Jewish state of Israel".
Orignal From: Bombs target Kenyas aid workers