The Siege of Beruit took place 25 years ago this summer. Here's a timeline of key events:
June 4 — Israeli planes bomb Beirut after an assassination attempt on the Israeli ambassador in London, Shlomo Argov (despite Palestine Liberation Organization's denial of responsibility).
The hit on Argov was ordered by Abu Nidal (Sabri al Banna) and one of the would-be assassins was his cousin. Abu Nidal had been expelled from Fatah, the main component of the PLO, in a 1974 dispute with PLO leader Yasser Arafat that led to inter-Palestinian bloodshed.
June 6 — An estimated 60,000 Israeli troops invade Lebanon, launching "Operation Peace for Galilee."
June 13 — Israelis finish circling West Beirut, the stronghold of Arafat's PLO.
Late June to August — Israel blockades, bombs and shells West Beirut to try to oust the PLO (with intermittent cease-fires). The United States mediates negotiations that eventually lead to a planned evacuation for PLO leaders and troops, along with Syrian troops.
Aug. 21 — About 350 French troops arrive as an advance unit of the international force to supervise the evacuation, which begins that day.
Aug. 23 — Lebanese legislature elects Bashir Gemayel president of Lebanon.
Aug. 25 — The remaining international troops arrive, including 800 U.S. Marines.
Sept. 1 — Evacuation of Palestinian and Syrian fighters ends. Marines and other members of the international force later withdraw.
Sept. 14 — President-elect Gemayel is assassinated in a bombing.
Sept. 16-18 — A Christian militia massacres hundreds of Palestinian men, women and children at two refugee camps.
Sept. 24-30 — A multinational peacekeeping force of French, Italian and U.S. troops are deployed in Beirut.
Compiled by NPR's Erica Ryan. Sources included Encyclopedia Britannica, the Library of Congress, Associated Press, UPI and Facts on File.