pushed for a simultaneous withdrawal of both ICU and Ethiopian forces under international supervision. September 2006 Baidoa Suicide Bombing On 18 September, 2006 the first suicide bombing in Somali history occurred in the TFG capital of Baidoa, when a truck loaded with explosives attempted to assassinate President Abdullahi Yusuf. Previous attacks on the TFG had been blamed on warlords, but the government would for the first time accuse radical elements within the ICU of the attack. The ICU would deny responsibility for the assassination attempt, instead pinning the blame on Ethiopian provocateurs. According to Professor Robert Pape of the University of Chicago, the decision to invite Ethiopian troops to invade Somalia created an ideal trigger for extremists to carry out Somalia's first ever suicide attack, as the deployment of foreign troops loyal to the Christian-dominated government in Ethiopia was viewed by the majority of ordinary Somali citizens as a threat to the nations sovereignty. Criticism of Islamic Courts Union rule Despite its significant achievements, the ICU would attract criticism for many of its actions. Extremist elements in ICU, who viewed the TFG as an Ethiopian puppet, would engage in assassinations of TFG personnel. Somalia's only popular drug, Khat, was outright banned. During the civil war many Somalis had relied the selling and distribution of the drug as one of their sole sources of income and consequently the ban had serious repercussions on people's ability to afford basic necessities. Charcoal exports were banned, on account of the industry devastating Somalia's fragile environment. Once again many Somalis had relied on the practice to make ends meet. There was serious ideological friction between the ‘moderate’ wing of the Islamic Courts led by the Chairman of the Islamic Courts’ "Executive Council", Sheikh Sharif, and the "radical" wing led by the Chairman of the Courts’ Shura (Consultative or Legislative Council), Sheikh Aweys. These ideological divisions became clear when various wings of the Islamic Courts started making policies and statements without reference to the collective leadership. Many of them – mostly "radically" conservative social policies – were not popular among the wider population. Ethiopian invasion and downfall To avoid turning Mogadishu into a warzone once again, the ICU peacefully withdrew from the city on December 26, 2006. The top leaders of the Islamic Courts Union, including Sheikh Hassan Dahir Aweys, Sheikh Sharif Sheikh Ahmed and Sheikh Abdirahman Janaqow, resigned the next day. On January 1, 2007,