The United States hopes a public report into the killing of former Lebanese prime minister Rafik Hariri will help to force Syria to come clean over its suspected involvement in the assassination.
German prosecutor Detlev Mehlis will brief the UN Security Council at an open meeting this afternoon.
His written report, released last Thursday, said the decision to kill Mr Hariri, an opponent of Syrian domination over Lebanon, "could not have been taken without the approval of top-ranked Syrian security officials".
Former Lebanese prime minister Rafik al_Hariri
Syria has vigorously denied the accusations.
The UN report named senior Syrian security officials and their Lebanese allies as suspects in the Hariri murder.
The killing led regional power Syria to pull its troops from Lebanon after three decades and has put increasing pressure on Lebanon's pro-Syrian president, Emile Lahoud, to resign.
Diplomats said the United States and France were working on a resolution demanding Syria co-operate with the investigation but may not seek to impose sanctions immediately.
Mr Mehlis criticised Syria's co-operation with his inquiry on the February 14th assassination in Beirut, saying he needed to conduct interviews outside of Syria and "for interviewees not to be accompanied by Syrian officials".