UN leader Ban Ki-moon has said he believes al-Qaeda committed a major bomb attack in Damascus that left dozens dead, and that up to 10,000 people have now been killed in Syria.
Ban said President Bashar al-Assad has still not implemented a peace plan agreed with UN-Arab League envoy Kofi Annan.
"Very alarmingly and surprisingly, a few days ago, there was a huge serious massive terrorist attack. I believe that there must be al-Qaeda behind it. This has created again very serious problems," Ban said at a youth event at the UN headquarters.