by foreign powers. As a result of President Ndadaye's murder, violence and chaos broke out all over Burundi. Hutu attacked and killed many UPRONA supporters, most of them Tutsi but also some Hutu, while the putschists and allied Tutsi groups assaulted Hutu and FRODEBU sympathizers. Many civilians banded together in local militias to defend themselves, but these groups quickly became proactive as well, carrying out attacks and mass killings against each other. Urban street gangs, many of which had been biethnic before 1993, split along ethnic lines and began to work for extremist politicians. They received money and guns, and in return demonstrated, and murdered on the orders of the Tutsi and Hutu parties. An estimated 50,000 to 100,000 people died within a year about as many Hutu as Tutsi. As result of this chaos and international pressure, the putschists' regime collapsed, and power was returned to a FRODEBU-dominated civilian government. The mass killings consequently abated, and the country was somewhat restabilized by the end of 1993. The coup and subsequent ethnic violence had however deeply affected the country. The Tutsi extremists in the military were still present, and though they had given up outright power for the time being, they continued to undermine the civilian government in hopes of regaining full power in the future. The Hutu rebels believed that the coup had proven the impossibility of negotiations, and regarded the new Hutu-dominated civilian government as mere "stooges" of the old regime. They consequently fully resumed their insurgency. Furthermore, radicals among the Tutsi civil society regarded FRODEBU as génocidaires, believing that the party had initiated the anti-Tutsi mass killings following the 1993 coup. They thus organized demonstrations and strikes to bring down what they considered a criminal regime. Decline of state authority, 1994–1996 A succession of bi-ethnic governments attempted to stabilize the country from early 1994 to July 1996, but all failed. Tutsi extremists in the army continued to undermine any attempt of FRODEBU to consolidate power, and parts of FRODEBU decided in early 1994 that compromise was no longer possible. Minister of Interior Léonard Nyangoma led a FRODEBU faction into armed rebellion, creating the National Council for the Defense of Democracy–Forces for the Defense of Democracy (Conseil national pour la défense de la démocratieForces pour la défense de la démocratie, CNDD-FDD). Nyangoma's group consequently became the most important Hutu rebel group, though PALIPEHUTU-FNL and FROLINA continued to be