</ ref > ▁In ▁September ▁ 1 9 9 0 , ▁left ist ▁milit ants ▁det on ate ▁ 5 3 ▁bomb s ▁that ▁kill ▁or ▁w ound ▁ 8 3 ▁Chile ans . ▁On ▁November ▁ 1 4 , ▁ 1 9 9 0 , ▁g end arm es ▁transferred ▁Marco ▁A riel ▁Antonio lett i , ▁a ▁senior ▁M J L ▁leader ▁from ▁j ail ▁to ▁a ▁hospital ▁for ▁treatment . ▁M J L ▁gu err illas ▁fought ▁their ▁way ▁into ▁the ▁S ó tero ▁del ▁Río ▁Hospital ▁but ▁were ▁forced ▁to ▁withdraw , ▁after ▁having ▁killed ▁four ▁g end arm es ▁and ▁one ▁car ab in ero . ▁In ▁ret ali ation , ▁Chile ' s ▁Investig ations ▁Police ▁execute ▁Antonio lett i ▁with ▁a ▁shot ▁in ▁the ▁fore head . ▁On ▁January ▁ 2 4 , ▁ 1 9 9 1 , ▁M J L ▁gu err illas ▁amb ushed ▁and ▁killed ▁two ▁car ab iner os . ▁On ▁February ▁ 2 8 , ▁ 1 9 9 1 , ▁a ▁car ab in ero ▁polic eman ▁died ▁in ▁a ▁shoot - out ▁in ▁Santiago ▁with ▁left ist ▁gu err illas ▁of ▁the ▁Manuel ▁Rodríguez ▁Patri otic ▁Front . ▁On ▁April ▁ 1 , ▁F PM R ▁gu err illas ▁assass in ated ▁right - wing ▁sen ator ▁Ja ime ▁Gu z man , ▁killing ▁him ▁as ▁he ▁left ▁a ▁university ▁campus ▁in ▁Santiago . ▁On ▁September ▁ 9 ▁three ▁gu err illas ▁kid n apped ▁Crist ian ▁Edwards