Islamic sharia courts. Subsequent attacks on the courts in several districts killed 28 people, including judges, lawyers, and police personnel guarding the courts. A government campaign against the Islamic extremists led to the arrest of hundreds of senior and mid-level JMB leaders. Six top JMB leaders were tried and sentenced to death for their role in the murder of two judges; another leader was tried and sentenced to death in absentia in the same case. In February 2006, the AL returned to Parliament, demanded early elections and requested significant changes in the electoral and caretaker government systems to stop alleged moves by the ruling coalition to rig the next election. The AL blamed the BNP for several high-profile attacks on opposition leaders and asserted the BNP was bent on eliminating Sheikh Hasina and the Awami League as a viable force. The BNP and its allies accused the AL of maligning Bangladesh at home and abroad out of jealousy over the government's performance on development and economic issues. Dialogue between the Secretaries General of the main ruling and opposition parties failed to sort out the electoral reform issues. Political crisis and Caretaker government, 2006–2008 The months preceding the planned 22 January 2007 elections were filled with political unrest and controversy. Following the end of Khaleda Zia's government in late October 2006, there were protests and strikes, during which 40 people were killed in the following month, over uncertainty about who would head the caretaker government. The caretaker government had difficulty bringing the all parties to the table. Awami League and its allies protested and alleged that the caretaker government favoured the BNP. The interim period was marked by violence and strikes. Presidential Advisor Mukhlesur Rahman Chowdhury negotiated with Sheikh Hasina and Khaleda Zia and brought all the parties to the planned 22 January 2007 parliamentary elections. Later Hussain Muhammad Ershad's nomination was cancelled; as a result, the Grand Alliance withdrew its candidates en masse on the last day possible. They demanded to have voters' lists published. Later in the month, the president Iajuddin Ahmed imposed a state of emergency. Iajuddin Ahmed resigned from the post of chief adviser, under the pressure of Bangladesh Army, and appointed Fakhruddin Ahmed, the new chief adviser. Political activity was prohibited. The military-backed government worked to develop graft and corruption cases against leaders and members of both major parties. In March 2007, Khaleda Zia's two sons,