Syria 'crumbling' after PM's defection
7 August 2012 Last updated at 07:10 BST
Western powers have said the defection of Syrian Prime Minister Riad Hijab is a sign that the regime of President Bashar al-Assad is crumbling.
Mr Hijab, the most senior Syrian figure to defect, on Monday denounced Syria's "terrorist regime" and said he was joining the revolution.
Susana Mendonca reports.