President Jacob Zuma urges everyone to pray for Nelson Mandela as the 94-year-old is back to hospital.

The former president of South Africa, Nelson Mandela, has been taken back to hospital suffering from a lung infection. President Jacob Zuma confirmed that the 94-year-old was readmitted just before midnight on Wednesday and said: "We appeal to the people of South Africa and the world to pray for our beloved Madiba and his family and to keep them in their thoughts.
"We have full confidence in the medical team and know that they will do everything possible to ensure recovery."

Mr Mandela's spokesman Mac Maharaj told Sky News that the former president was "conscious".

He said: "At the moment doctors are saying it is a recurrence of an old lung infection. It is a matter of concern ... He was admitted around midnight last night.

"They are doing everything they can to keep him comfortable and happy."

He said that last time he had seen Mr Mandela he had been frail but in a "good frame of mind".

Mr Mandela spent 18 days in hospital in December, where he was treated for a lung infection and gallstones.

He was discharged on December 27, however, doctors warned he was "not yet fully recovered" and he continued to receive medical treatment at his Johannesburg home, including being given extra oxygen.

Mr Mandela has had recurring lung problems since contracting tuberculosis in 1988, during his 27 years in prison under the apartheid regime.

The Nobel Peace Laureate spent a night in hospital on March 9 for what was described as a scheduled medical check-up.

However, Sky News' Special Correspondent Alex Crawford said that it was now understood that the visit was required for further treatment of the lung infection and that on that occasion he is believed to have had his lungs drained.

She said that there were now significant concerns over his health and added: "The time of his hospitalisation certainly suggests they were alarmed at his deterioration."

In February, Mr Mandela's granddaughters showed the first picture of him to be seen in more than seven months as they promoted a reality television series in which they star.

He was seen with his great grandson, Zen, sitting on his lap at his Johannesburg home.

Earlier this month, George Bizos, the human rights lawyer who represented Mr Mandela at his treason trial, said that he was suffering memory lapses and sometimes forgot his fellow anti-apartheid activists were dead.

In an interview he told Eyewitness News: "Unfortunately he sometimes forgets that one or two of them had passed on and has a blank face when you tell him that Walter Sisulu and some others are no longer with us."

In February 2012 Mr Mandela, who is known by his tribal name of Madiba in South Africa, spent the night in hospital after a minor exploratory procedure to investigate persistent abdominal pain.

In 2001 he had radiotherapy treatment for prostate cancer.

Mr Mandela, who was released from prison in 1990, suffered damage to his tear glands because of being forced to smash limestone rocks in the quarry on Robben Island due to the alkalinity of the stone. He had cataract surgery at the age of 75, in 1994, a few months after being sworn in as president.

Mr Mandela stepped down after one term as president. He has not appeared in public since South Africa's World Cup final in 2010, six years after retiring.