The exposure of an alleged assassination plot by key officials in Syria could cause the regime in Damascus to collapse, undermining America’s efforts to prevent terrorists from slipping across the border with Iraq, US intelligence agencies have warned. A United Nations report accusing senior Syrians of complicity in the murder in February of Rafik Hariri, a former Lebanese prime minister, has caused diplomatic dilemmas for President George W Bush and Bashar Assad, the Syrian president. Full Story