Israel and Hamas at war: A timeline of major developments in the year since Oct. 7, 2023

The Iranian-backed group Hamas, long designated a terrorist organization by the U.S. and Israel, launched an unprecedented attack on Israel on Oct. 7, 2023. The massacre of some 1,200 people ignited a devastating war in the Gaza Strip, a densely-packed Palestinian territory that had been ruled by Hamas for almost two decades. The Hamas-run Ministry of Health says Israeli military operations in Gaza since Oct. 7 have killed almost 42,000 people. 

Below is a timeline showing some of the key events in the year that has passed since many Israelis' sense of security was shattered on that Saturday morning.