Vigils continue for ailing Mandela

Members of Saint Anthony Of Paudua Prayer Group from Pretoria, South Africa, pray outside the Mediclinic Heart Hospital, where former South African president Nelson Mandela is being treated in Pretoria, South Africa, July 3, 2013.

Mandela, 94, is being treated for a recurring lung infection. The anti-apartheid icon and Nobel Peace Prize laureate has been in critical condition at the hospital for more than three weeks.

People release lanterns outside Nelson Mandela's house in Johannesburg July 1, 2013. Mandela remains in critical condition in a hospital in Pretoria, South Africa.

Supporters write messages of love and hope on a photograph left outside the Mediclinic Heart Hospital, where former South African President Nelson Mandela, 94, is being treated for a recurring lung infection in Pretoria, South Africa, July 3, 2013.

Thirty-six South African Police Academy trainees leave flowers for former South African President Nelson Mandela outside the Mediclinic Heart Hospital in Pretoria, South Africa, June 25, 2013.

Candles burn for Nelson Mandela outside the Mediclinic Heart Hospital in Pretoria, South Africa, July 3, 2013.

Men from the Bangladeshi community in South Africa pray in support of former South African President Nelson Mandela at the entrance of the Mediclinic Heart Hospital, where Nelson Mandela is being treated, in Pretoria, South Africa, July 3, 2013.

A large crowd of supporters cheer after singing the South African national anthem outside of the Mediclinic Heart Hospital in Pretoria, South Africa, June 25, 2013.

Ruling party supporters gather outside the Mediclinic Heart Hospital in Pretoria, South Africa, June 27, 2013.

Letters and messages of support are placed at a fence at the entrance of the Mediclinic Heart Hospital, where Mandela is being treated, in Pretoria, South Africa, July 3, 2013.

A street vendor sells Tata Madiba (Father Madiba) T-shirts outside the Mediclinic Heart Hospital in Pretoria, South Africa, July 3, 2013.

Members of the ruling party youth league sing outside the Mediclinic Heart Hospital in Pretoria, South Africa, June 27, 2013.

Supporters write messages of love and hope on a poster left outside the Mediclinic Heart Hospital, where former South African President Nelson Mandela, 94, is being treated for a recurring lung infection, in Pretoria, South Africa, July 3, 2013.