In 1950, Tribhuvan went into exile at the Indian Embassy in a campaign aimed at removing the Ranas from power, in response Gyanendra, grandson of Tribhuvan was named the new king of Nepal by the Rana government. Tribhuvan returned to Nepal after a mutual agreement between Ranas (which ended the Ranas rule) and was crowned the king again in 1951. Upon Tribhuvan's death, Mahendra became king in 1955. In 1960, he began the party-less political system, Panchayat. During a hunting event, he suffered a heart attack, and his son Birendra assumed the throne in 1975, two years after his father's death. In 1990, pro-democracy riots broke out in Nepal, resulting in the country becoming a constitutional monarchy. On 1 June 2001, the Nepalese royal family were killed in a mass shooting, including the king, and the government named Birendra's son Dipendra as the perpetrator. Dipendra went into a coma after shooting himself and was declared king while in the coma; he died in hospital three days later. His uncle Gyanendra was crowned again and his reign saw the growing insurgency of the Nepalese Civil War. In 2008, Gyanendra stepped down as the king of Nepal and the country became the Federal Democratic Republic of Nepal.