equ iel ▁A ro ca ▁C ue vas ▁was ▁killed ▁in ▁the ▁city ▁of ▁Con cep ción , ▁when ▁social ist ▁milit ants ▁open ▁fire ▁on ▁the ▁bus ▁he ▁was ▁trav elling . ▁On ▁ 2 7 ▁February ▁ 1 9 7 3 , ▁M IR ▁gu err illas ▁attacked ▁the ▁L lan qu ih ue ▁police ▁station , ▁shooting ▁and ▁w ounding ▁ 1 0 ▁car ab ine ers . ▁In ▁March ▁ 1 9 7 3 , ▁ 1 6 - year - old ▁Germ án ▁En rique ▁González ▁and ▁ 1 7 - year - old ▁Ser gio ▁Oscar ▁Ver g ara , ▁both ▁members ▁of ▁the ▁Christian ▁Dem ocrat ▁Party ▁were ▁killed ▁while ▁resist ing ▁the ▁take over ▁of ▁the ▁La ▁Re ina ▁estate . ▁On ▁ 2 ▁April ▁ 1 9 7 3 , ▁M IR ▁gu err illas ▁operating ▁in ▁Santiago ▁shoot ▁and ▁kill ▁a ▁police ▁detect ive , ▁Gabriel ▁Rodríguez ▁Al ca í no . ▁In ▁May ▁ 1 9 7 3 , ▁Mario ▁Agu ilar , ▁a ▁member ▁of ▁the ▁Mov imiento ▁Pat ria ▁y ▁Libert ad ▁is ▁g unn ed ▁down ▁by ▁left ists ▁in ▁dow nt own ▁Santiago . ▁On ▁ 2 7 ▁July ▁ 1 9 7 3 , ▁a ▁far mer ▁and ▁member ▁of ▁the ▁Christian ▁Dem ocrat ▁Party , ▁Jorge ▁M ena , ▁is ▁surrounded ▁by ▁left ists ▁and ▁club bed ▁to ▁death ▁in ▁Os orno . ▁The ▁next ▁day , ▁another ▁far mer , ▁Juan ▁Luis ▁Ur rut ia