10/08/2009 - A report from an American think-tank has estimated 1.57 billion Muslims populate the world - with 60% in Asia.
The report, by the Pew Forum on Religion and Public Life, took three years to compile, with census data from 232 countries and territories.
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Researchers analysed approximately 1,500 sources including census reports, demographic studies and general population surveys.
Senior researcher Brian Grim told CNN that the overall figure was a surprise and said: "Overall, the number is higher than I expected."
Read the full article One in Four is Muslim, Study Says on the BBC News Web site.