Eddie Izzard pauses marathon tribute to Nelson Mandela

Eddie Izzard has called his multi-marathon attempt, in honour of Nelson Mandela, to a sudden halt after four days.

The 50-year-old comedian had planned to complete 27 marathons in 27 days to reflect the number of years former South African president Mandela spent in prison.

However, after four days he took to his Facebook page to announce he was pulling out of the effort for the time being, citing "unforeseen medical complications".

Izzard blamed "a multitude of factors including severe terrain, humidity and altitude".

The star has, however, vowed to see through his tribute to Mandela, adding: "I wish to say that my attempt is not over and I will return to South Africa and run the 27 marathons and finish this story.

"I owe that to Nelson Mandela who has inspired the world to struggle and succeed no matter what obstacles are thrown at us."

Back in 2009, Izzard - a seasoned runner - finished 43 marathons in 51 days for Sport Relief.