By Nadim Ladki BEIRUT (Reuters) – The leaders of Syria and Lebanon could be fighting for political survival if, as many expect, a U.N. inquiry blames Syrian and pro-Syrian Lebanese officials for the killing of Lebanese former Prime Minister Rafik al-Hariri. Analysts and diplomats say they expect a cycle of bombings and killings to continue or intensify in Lebanon, where Syrian influence remains strong and where pro-Syrians will challenge any such U.N. findings as politically motivated. Chief U.N. investigator Detlev Mehlis presents his report to Secretary-General Kofi Annan on Friday over the February 14 assassination of Hariri and 20 others in a truck bomb in Beirut.Diplomats and Lebanese political sources have told Reuters they expect Mehlis to name some Syrian officials in his report, as well as several pro-Syrian Lebanese officials and others.It was not clear whether the suspects would include members of Syrian President Bashar al-Assad’s inner circle.