against the Israeli West Bank Barrier carried out in villages like Bi'lin, Biddu and Budrus. This model of resistance has spread to other villages like Beit Sira, Hebron, Saffa, and Ni'lein. During the Israeli re-invasion of Jenin and Nablus, "A Call for a Non-violent Resistance Strategy in Palestine" was issued by two Palestinian Christians in May 2002. Non-violent tactics have sometimes been met with Israeli military force. For example, Amnesty International notes that "10-year-old Naji Abu Qamer, 11-year-old Mubarak Salim al-Hashash and 13-year-old Mahmoud Tariq Mansour were among eight unarmed demonstrators killed in the early afternoon of May 19, 2004 in Rafah, in the Gaza Strip, when the Israeli army open fire on a non-violent demonstration with tank shells and a missile launched from a helicopter gunship. Dozens of other unarmed demonstrators were wounded in the attack." According to Israeli army and government officials, the tanks shelled a nearby empty building and a helicopter fired a missile in a nearby open space in order to deter the demonstrators from proceeding towards Israeli army positions. Israel The Israel Defense Forces (IDF) countered Palestinian attacks with incursions against militant targets into the West Bank and Gaza Strip, adopting highly effective urban combat tactics. The IDF stressed the safety of their troops, using such heavily armored equipment as the Merkava heavy tank and armored personnel carriers, and carried out airstrikes with various military aircraft including F-16s, drone aircraft and helicopter gunships to strike militant targets. Much of the ground fighting was conducted house-to-house by well-armed and well-trained infantry. Due to its superior training, equipment, and numbers, the IDF had the upper hand during street fighting. Palestinian armed groups suffered heavy losses during combat, but the operations were often criticized internationally due to the civilian casualties often caused. Palestinian metalworking shops and other business facilities suspected by Israel of being used to manufacture weapons were regularly targeted by airstrikes, as well as Gaza Strip smuggling tunnels. Israeli Caterpillar D9 armored bulldozers were routinely employed to detonate booby traps and IEDs, to demolish houses along the border with Egypt that were used for shooting at Israeli troops, to create "buffer zones", and to support military operations in the West Bank. Until February 2005, Israel had in place a policy to demolish the family homes of suicide bombers after giving them a notice to evacuate. Due to the considerable number of Palestinians living in single homes,