The banning of MIR by the Christian Democratic government in 1969 drastically changed the organization of MIR, which entered a clandestine political existence with semi-autonomous operative-structures that survived even during the first years of the military resistance of MIR against the 1973 Chilean coup. The threat from the MIR was underlined by the discovery at the end of May of a guerrilla training camp in the southern province of Valdivia. Beginning in March 1968, a series of MIR bomb attacks took place in various parts of the country that targeted, among others, the U.S. consulate, the Chilean-American Institute in Rancagua, the main office of the Christian Democratic Party, the office of Chile's largest-selling "El Mercurio" newspaper and the residence of senator Francisco Bulnes of the National Party.