Protests were first triggered by a proposed amnesty bill which would have pardoned politicians of various charges from the period following the 2006 coup d'état. Anti-government protestors argued the bill, and a simultaneous government attempt to alter the 2007 constitution, favoured Thaksin and would potentially allow him to return from self-imposed exile due to a corruption conviction. The pro-government Red Shirt movement also opposed the amnesty due to its inclusion of murder charges related to the 2010 military crackdown on pro-Thaksin protests, in which 91 were killed. Opposition from across the political spectrum caused the bill to be rejected unanimously by the Senate of Thailand. Anti-government protests continued however, with demonstrators occupying government offices, blocking major road intersections and holding mass rallies in Bangkok to call for the resignation of Yingluck and her Pheu Thai government. On 8 December 2013, all 153 opposition Democrat Party MPs resigned and Yingluck dissolved the House of Representatives, calling a snap general election for 2 February. Voting was disrupted in areas of Bangkok and southern Thailand by PDRC protesters blocking entry to polling stations, leading to an annulment of the result by the Constitutional Court. Sporadic violence, including shootings, bomb attempts and grenades thrown at protesters led to 28 deaths and over 800 injuries during the course of the protests. On 21 January, Yingluck's government declared a state of emergency in Bangkok and the surrounding areas, to little effect.