Lebanon's opposition has urged the country's Syrian-backed security chiefs to resign to make way for an international inquiry into the killing of former Prime Minister Rafiq al-Hariri. "It is not possible to carry out a just, serious, clear and transparent investigation if the heads of the agencies remain in their place," leading Druze and opposition figure Walid Jumblatt told reporters at his mountain residence in Beirut on Saturday. "We warned against a security state over and over." A UN fact-finding team said in a report released on Thursday that Lebanon's inquiry into al-Hariri's 14 February killing was seriously flawed and called for an international investigation, long a demand of the opposition that holds Damascus and the security services it backs responsible. But the report said even an international inquiry was unlikely to carry out its tasks satisfactorily while the Lebanese security chiefs stayed.