Security tightened for Obama's Kenyan family: official

NAIROBI: Kenya has tightened security around the home of US President Barack Obama's step-grandmother after the killing of Osama bin Laden, an official said Thursday.

"In the wake of security challenges including terror threats, I can confirm that we decided to enhance security at the home of Mama Sarah...," said regional administrator Francis Mutie, using the popular name for Obama's step-grandmother who lives in western Kenya.

There have been no direct threats against the family but Kenya is on the alert after threats by Al-Qaeda followers after Bin Laden was killed by US special forces in Pakistan on May 2.