(Reuters) – Lebanon’s pro-Syrian political coalition was in disarray on Thursday, with a key figure saying he could no longer work with President Emile Lahoud, another top ally of Damascus. Tensions boiled over a day after Prime Minister Omar Karami stepped down after he failed to agree a cabinet with pro-Syrian allies, deepening the worst political crisis since the 1975-1990 civil war. With Syrian forces streaming out of Lebanon in line with an April 30 deadline for an end to Damascus’s 29-year-old military and intelligence presence, its allies in Beirut are increasingly squabbling over how to move forward.