Iran FM: Sectarian strife is 'threat to all of us'
11 November 2013 Last updated at 06:46 GMT
Iran's foreign minister says tension between Shia and Sunni Muslims is probably the most serious threat to world security.
Mohamed Javad Zarif blamed some Sunni countries for what he called fear-mongering.
Mr Zarif has been speaking to the BBC's Jeremy Bowen about how the fighting in Syria has developed into a sectarian conflict.