Beirut bus massacre: A confrontation between Phalangist paramilitaries and PLO militia marks the start of the 15-year Lebanese Civil War.

The 1975 Beirut bus massacre, also known as the Ain el-Rammaneh incident and Black Sunday, was the collective name given to a short series of armed clashes involving Phalangist and Palestinian elements in the streets of central Beirut, which is commonly presented as the spark that set off the Lebanese Civil War in the mid-1970s.