Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Gaza Observes 1st Anniversary of Israeli Offensive About 1,400 Palestinians and 13 Israelis were killed, millions of dollars worth of Gazan infrastructure damaged in the 22-day Israeli attack on the territory VOA News 27 December 2009 Photo: AP A Palestinian Hamas security officer stands next to a poster of the Palestinian parliament building before and after Israel's offensive, in Gaza City, Sunday, 27 Dec. 2009 Palestinians in the Gaza Strip have held a minute's silence to observe the first anniversary of Israel's launch of a major offensive against the territory's Hamas rulers. Sirens wailed across Gaza Sunday morning, marking the moment that Israeli warplanes began simultaneous strikes on Hamas targets on December 27, 2008. Israel said the air and ground offensive was aimed at stopping years of rocket attacks from Gaza on Israeli communities. By the time Israel and Hamas declared unilateral cease-fires on January 18 this year, the war had killed about 1,400 Palestinians and 13 Israelis. Israel's bombardment also left many parts of Gaza in ruins. Gazans largely have been unable to rebuild due to an Israeli and Egyptian blockade of the territory that has been in place since Hamas seized power there in 2007. U.N. Secretary-General Ban Ki-moon said in a statement Sunday there is a "sense of hopelessness" in Gaza among its 1.5 million residents, half of whom are under 18 years old. He says the fates of Gaza's people and their Israeli neighbors are intimately connected. Israel and Egypt allow aid into Gaza but block delivery of construction materials that Israel fears could be diverted to military use by militants. Human rights groups have accused Israel and Hamas of committing war crimes during the 22-day long conflict - accusations that both sides deny. Some information for this report was provided by AP, AFP and Reuters. .