The east African country , which mengirm troops into Somalia in October 2011 to pursue the rebels , suffered a series of gun attacks , bombs and grenades . Attacks blamed on al Shabaab , including an attack in the capital , Nairobi , on Friday.
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Britain , the United States and other Western governments warned travelers not to visit Kenya .
" A total of 12 people , among them three members of reserve policemen were killed in an attack in Mandera Region al Shabaab militia on Monday evening , " said National Disaster Operations Center ( NDoc ) in government-run Twitter.
NDoc mengatakaan two police vehicles were destroyed . The members of the police reserve along with police and unusual in official uniform but sometimes wear a uniform jackets .
Mandera area , near the border with Ethiopia and Somalia , hit by an attack that increased tension , with inter- tribal clashes in which hundreds of people were displaced last year .
The area was a flood of weapons due to its proximity to Somalia where al Shabaab insurgents to overthrow the government .