On 1 July 2008 a riot broke out in the Mongolian capital of Ulan Bator. The riot was sparked by allegations of fraud surrounding the 2008 legislative election which occurred three days earlier. While initially a peaceful protest, the riot resulted in Mongolia's first state of emergency which lasted four days, and a military presence (lasting two of those days) was brought into the city to quell the riot. Five people were killed, and the headquarters of the Mongolian People's Revolutionary Party (whom had won the election) was set on fire. Additional suggested causes for the riot include a change to the electoral system which was not well understood, and an increased division between Mongolia's rich and poor population.