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Al-Shabaab militants suspected in grenade attack.

Two Kenyan police officers were shot dead and their rifles were stolen on Sunday in the northern town of Garissa near the border with Somalia.

A man walks over an open sewer on June 8, 2012 at Kibera slum, in the Kenyan capital Nairobi.

TONY KARUMBA

AFP/Getty Images

nairobi bombing kenya