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Churches across South Africa are to hold prayers for Nelson Mandela, who has been in hospital for four days being treated for pneumonia.
Several hundred people are expected to gather at the Regina Mundi church in Soweto once a focal point of the struggle against apartheid.
After Mr Mandela was admitted to hospital late on Wednesday, President Jacob Zuma said people must not panic.
The former president first contracted tuberculosis in the 1980s while detained on windswept Robben Island.
His lungs are said to have been damaged while working in a prison quarry. This latest spell in hospital is his fourth in just over two years.
Mr Mandela served as South Africas first black president from 1994 to 1999 and is regarded by many as the father of the nation for leading the struggle against apartheid.
More info @ BBC News
About Nelson Mandela
Nelson Rolihlahla Mandela is a South African anti-apartheid activist, revolutionary and politician who served as President of South Africa from 1994 to 1999, the first to be elected in a fully representative, multiracial election. His administration focused on dismantling apartheids legacy, and cutting racism, poverty and inequality. Politically a democratic socialist, he served as president of the African National Congress political party from 1991 to 1997. Internationally, Mandela was the Secretary-General of the Non-Aligned Movement from 1998 to 1999.
Born: Jul 18, 1918 (age 94) · Mvezo
Height: 6 (1.83 m)
Spouse: Graça Machel (1998) · Winnie Madikizela-Mandela (1958 1996) ·
Founded: African National Congress · Umkhonto we Sizwe ·
Children: Makgatho Mandela · Makaziwe Mandela · Zindziswa Mandela ·