White Widow's Joburg love story

Samantha Lewthwaite, the "White Widow" of one of the London July 7 bombers, later married into a Kenyan family connected to one of al-Qaeda's most notorious commanders in East Africa.

She then lived in Johannesburg for at least two years before moving to Kenya in 2011 and later to Somalia, where she is in hiding.

These details about one of the world's most wanted terrorists are revealed in a new BBC television documentary, White Widow: Searching for Samantha, which will be broadcast in the UK tomorrow.

Her new sister-in-law's husband was Musa Dheere, who was shot dead at a roadblock in the Somali capital, Mogadishu, alongside Fazul Mohammed, the mastermind of terror attacks on Kenya's coast in 2002 that were among al-Qaeda's earliest.

Lewthwaite, whose first husband was the July 7 attacker Germaine Lindsay, is charged with plotting a bombing campaign across Kenya at Christmas 2011.

When Kenyan police broke up her terror cell on December 19 that year Lewthwaite was so close to the family of her new husband, Fahmi Jamal Salim, that she fled to their home.

She met Salim, a Kenyan, by whom she is thought to have had the two youngest of her four children, in South Africa in 2008. They were introduced by Abdullah al-Faisal, a radical Muslim hate preacher who had been imprisoned for four years in the UK. Lewthwaite visited him in jail on several occasions.

A l-Faisal told the BBC that he arranged her marriage to the Kenyan because he "knew her taste". She wanted a "young man of a different race, preferably the black race, who was very handsome and very strong in the Muslim faith", A l-Faisal said.

The couple are believed to have lived in South Africa where Salim ran a medical supply business in Brixton, Johannesburg. Both Lewthwaite and Salim travelled to Kenya on fake South African passports in 2011.

Kenya's National Intelligence Service named them as members of a terror cell that planned to bomb the parliament building in Nairobi, the UN headquarters in the city, and an Ethiopian restaurant popular with Somali politicians.

Lewthwaite and Salim escaped as police closed in on them and she is thought to be in hiding in southern Somalia, sheltered in territory controlled by al-Shabab, an al-Qaeda affiliate.