While it is not yet confirmed that she was at Westgate, there is no doubt that Samantha Lewthwaite has become a key figure in the Somalia-based terrorist organisation Al-Shabab, which masterminded the audacious attack.

The widow of 7/7 bomber Germaine Lindsay, she claimed ignorance of the plans to bomb London in 2005 and was even given police protection at her home in Aylesbury. The police lost track of her until she reappearred in Kenya in 2012 where she was accused of involvement in a terror plot in Mombasa. But she escaped arrest and has been on the run ever since. Her reputation has grown and she is now seen as a key communicator for the network.

Presenter Simon Cox first reported on Samantha Lewthwaite's story in April 2012. In the wake of the Westgate shopping centre attacks, The Report gives listeners another chance to hear how the daughter of a former British soldier rose to prominence in the jihadist group responsible for the killings.

Producers: Lucy Proctor and Sally Chesworth.