Kenya: Who were the Nairobi Westgate attackers?

A British woman is thought to be among militants who killed at least 62 people at a Kenyan shopping centre, the country's foreign minister has said.

Her comments have fuelled speculation about the possible involvement in the attack of British terror suspect Samantha Lewthwaite - the widow of 7 July suicide bomber Germaine Lindsay.

She is known to be in East Africa and is wanted by Kenyan police over alleged links to a terrorist cell that planned to bomb the country's coast.

But government officials have advised caution when it comes to Ms Lewthwaite's possible involvement in the Nairobi Westgate shopping complex attack.

Frank Gardner reports.