Operation Returning Echo ( ) was an Israel Defense Forces (IDF) military operation in the Gaza Strip from March 9 until March 14, 2012. It was the worst outbreak of violence covered by the media in the region since the 20082009 Gaza War (Operation Cast Lead).On March 9, Israel carried out a targeted air strike in the Gaza Strip killing Zohair al-Qaisi, the secretary general of the Popular Resistance Committees (PRC). Another militant was also killed in the strike, as well as seriously injuring a man nearby. According to the IDF, though the PRC denies this, Al-Qaisi had overseen the 2011 southern Israel cross-border attacks, which killed eight Israelis including six civilians. Israeli officials said that he was preparing the final stages of a new mega-attack that could have claimed multiple lives. Palestinian militant groups retaliated by launching rocket attacks on Israel, with over 300 Grad missiles, Qassam rockets and mortar shells launched, of which 177 hit Israeli territory striking the major urban centers of Ashdod, Ashkelon and Beersheba, as well as smaller communities. Twenty-three Israelis were injured, all of them civilians, and schools throughout southern Israel were kept closed for most of the week to protect students from rocket fire. Israel's Iron Dome missile defense system intercepted many of the Palestinian-launched projectiles aimed at large cities, shooting down 56 rockets in 71 attempts.Israel attacked with 37 air strikes on Gazan weapons storage facilities, rocket launching sites, weapon manufacturing facilities, training bases, posts, tunnels and militants, killing 22, mostly from Palestinian Islamic Jihad and the others from the Popular Resistance Committees. Four civilians were killed as well. Another 74 Palestinians were reportedly injured during the conflict, mostly civilians. Some deaths and injuries among Palestinian civilians during the escalation, which were reported as casualties of the clashes, were later shown to be unrelated to Israeli actions.The United States, France, and an official from the United Nations condemned the Palestinian attacks, and the US stressed that Israel has the right to defend itself. The Organization of the Islamic Conference, the Arab League, Syria, Egypt and Iran condemned Israel's responsive air strikes on militants. On March 13, Egypt brokered a ceasefire between Israel and Palestinian militant groups.

Hamas did not participate in the fighting directly, and insisted that all-out war would "be devastating to the Palestinian people."

The Gaza Strip (; Arabic: قِطَاعُ غَزَّةَ Qiṭāʿu Ġazzah [qi.tˤaːʕ ɣaz.zah]), or simply Gaza, is a Palestinian enclave on the eastern coast of the Mediterranean Sea. It borders Egypt on the southwest for 11 kilometers (6.8 mi) and Israel on the east and north along a 51 km (32 mi) border. The Gaza Strip and the West Bank are claimed by the de jure sovereign State of Palestine.

The territories of Gaza and the West Bank are separated from each other by Israeli territory. Both fell under the jurisdiction of the Palestinian Authority, but the Strip has, since the Battle of Gaza in June 2007, been governed by Hamas, a militant, Palestinian, fundamentalist Islamic organization, which came to power in the last-held elections in 2006. It has been placed under an Israeli and US-led international economic and political boycott from that time onwards.The territory is 41 kilometers (25 mi) long, from 6 to 12 kilometers (3.7 to 7.5 mi) wide, and has a total area of 365 square kilometers (141 sq mi). With around 1.85 million Palestinians on some 362 square kilometers, Gaza, if considered a top-level political unit, ranks as the 3rd most densely populated in the world. An extensive Israeli buffer zone within the Strip renders much land off-limits to Gaza's Palestinians. Gaza has an annual population growth rate of 2.91% (2014 est.), the 13th highest in the world, and is often referred to as overcrowded. The population is expected to increase to 2.1 million in 2020. In 2012, the United Nations Country Team (UNCT) in the occupied Palestinian territory warned that the Gaza Strip might not be a "liveable place" by 2020; as of 2020, Gaza had suffered shortages of water, medicine and power, a situation exacerbated by the coronavirus crisis. According to Al Jazeera, "19 human rights groups urged Israel to lift its siege on Gaza". The UN has also urged the lifting of the blockade, while a report by UNCTAD, prepared for the UN General Assembly and released on 25 November 2020, said that Gaza's economy was on the verge of collapse and that it was essential to lift the blockade. Due to the Israeli and Egyptian border closures and the Israeli sea and air blockade, the population is not free to leave or enter the Gaza Strip, nor is it allowed to freely import or export goods. Sunni Muslims make up the predominant part of the population in the Gaza Strip.

Despite the 2005 Israeli disengagement from Gaza, the United Nations, international human rights organisations, and the majority of governments and legal commentators consider the territory to be still occupied by Israel, supported by additional restrictions placed on Gaza by Egypt. Israel maintains direct external control over Gaza and indirect control over life within Gaza: it controls Gaza's air and maritime space, as well as six of Gaza's seven land crossings. It reserves the right to enter Gaza at will with its military and maintains a no-go buffer zone within the Gaza territory. Gaza is dependent on Israel for water, electricity, telecommunications, and other utilities. The system of control imposed by Israel was described by Jerome Slater in the Fall 2012 edition of International Security as an "indirect occupation". Some Israeli analysts have disputed the idea that Israel still occupies Gaza, and have depicted the territory as a de facto independent state.

When Hamas won a majority in the 2006 Palestinian legislative election, the opposing political party, Fatah, refused to join the proposed coalition, until a short-lived unity government agreement was brokered by Saudi Arabia. When this collapsed under pressure from Israel and the United States, the Palestinian Authority instituted a non-Hamas government in the West Bank while Hamas formed a government on its own in Gaza. Further economic sanctions were imposed by Israel and the European Quartet against Hamas. A brief civil war between the two Palestinian groups had broken out in Gaza when, apparently under a US-backed plan, Fatah contested Hamas's administration. Hamas emerged the victor and expelled Fatah-allied officials and members of the PA's security apparatus from the strip, and has remained the sole governing power in Gaza since that date.