Fidel Castro announces retirement

Cuba's ailing leader Fidel Castro has announced he will not return to the presidency, in a letter published by official Communist Party paper, Granma.
"I neither will aspire to, nor will I accept, the position of president of the council of state and commander in chief," he wrote in the letter.
Mr Castro handed over power temporarily to his brother, Raul, in July 2006 when he underwent intestinal surgery.
The 81-year-old has ruled Cuba since leading a communist revolution in 1959.
In December, Mr Castro indicated that he could possibly step down in favour of younger leaders.
Soon afterwards, Raul Castro appeared to suggest that his older brother still had an important political role to play, saying the president still had full use of his mental faculties and was being consulted on all important policy issues.