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21 March 2013 Last updated at 13:47 ET
A leading Syrian pro-government Sunni cleric has been killed by an explosion at a mosque in the centre of the capital, Damascus, state media report.
State TV said Mohammed al-Buti had been killed at the Iman mosque by a "terrorist suicide attack".
Reuters news agency quoted local residents as saying the blast was caused by a mortar round.
The reports come as the UN said it would investigate the possible use of chemical weapons in Syria this week.
