Who is the 'white widow' Samantha Lewthwaite?
26 September 2013 Last updated at 16:36 BST
International police body Interpol has issued its highest level wanted persons notice on behalf of Kenyan authorities for Briton Samantha Lewthwaite, known as the 'white widow'.
Ms Lewthwaite is the widow of one of the four suicide bombers who attacked London on 7 July 2005 and has been linked with the Somali militant Islamist group al-Shabab - the organisation behind the attack on Nairobi's Westgate shopping mall.
Security correspondent Frank Gardner explains why Samantha Lewthwaite's Kenyan charges relate not to this month's Westgate attack but to her "alleged possession of explosives in December 2011 and an alleged plot at that time to bomb a number of tourist resorts"