groups described as a retaliation, a 29-year-old preacher from Hebron, Raed Abdel-Hamed Mesk, broke a unilateral Palestinian ceasefire by killing 23 and injured over 130 in a bus bombing in Jerusalem. Israeli organization B'Tselem states that there have been "grave violations" of Palestinian human rights in Hebron because of the "presence of the settlers within the city." The organization cites regular incidents of "almost daily physical violence and property damage by settlers in the city", curfews and restrictions of movement that are "among the harshest in the Occupied Territories", and violence by Israeli border policemen and the IDF against Palestinians who live in the city's H2 sector. According to Human Rights Watch, Palestinian areas of Hebron are frequently subject to indiscriminate firing by the IDF, leading to many casualties. One former IDF soldier, with experience in policing Hebron, has testified to Breaking the Silence, that on the briefing wall of his unit a sign describing their mission aim was hung that read: "To disrupt the routine of the inhabitants of the neighbourhood." Hebron mayor Mustafa Abdel Nabi invited the Christian Peacemaker Teams to assist the local Palestinian community in opposition to what they describe as Israeli military occupation, collective punishment, settler harassment, home demolitions and land expropriation. A violent episode occurred on 2 May 1980, when an Al Fatah squad killed five yeshiva students and one other person on their way home from Sabbath prayer at the Tomb of the Patriarchs. The event provided a major motivation for settlers near Hebron to join the Jewish Underground. On July 26, 1983, Israeli settlers attacked the Islamic University and shot three people dead and injured over thirty others. The 1994 Shamgar Commission of Inquiry concluded that Israeli authorities had consistently failed to investigate or prosecute crimes committed by settlers against Palestinians. Hebron IDF commander Noam Tivon said that his foremost concern is to "ensure the security of the Jewish settlers" and that Israeli "soldiers have acted with the utmost restraint and have not initiated any shooting attacks or violence." Historic sites The Old City of Hebron was a declared a World Heritage Site by UNESCO on 7 July 2017, despite opposition from Israeli officials who objected to it not being called Israeli or Jewish. The most famous historic site in Hebron is the Cave of the Patriarchs. The Herodian era structure is said to enclose the tombs of the biblical Patriarchs and