Francis urged Kenyans to work for peace amid rise in militant violence.
At least 18 people died, 37 injured in southern Algeria refugee camp.
Police deny alleged shelling attack on president's office.
Measure is part of attempt to stop jihadist activity in the country.
Blast occurred in area hit hard by the Boko Haram insurgency.
Similar attempts to extend power have provoked violence in Burundi and the Republic of Congo.
Hama Amadou fled last year in wake of child trafficking scandal.
Burundi has been grappling with election-related violence for months.
President Barack Obama praised country's commitment to democracy since the end of the 2003 civil war.
Bomber targeted Shia Muslim procession in northern Nigeria.
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