▁Colombia ' s ▁eastern ▁mountains . ▁ ▁Tow ards ▁the ▁end ▁of ▁ 1 9 9 0 , ▁the ▁army , ▁with ▁no ▁advance ▁warning ▁and ▁while ▁negoti ations ▁were ▁still ▁on going ▁with ▁the ▁group , ▁attacked ▁and ▁seized ▁four ▁linked ▁bases . ▁The ▁last ▁of ▁these ▁a ▁comp ound ▁known ▁as ▁Casa ▁Ver de , ▁which ▁hous ed ▁the ▁National ▁Secret ariat ▁of ▁the ▁F AR C – EP , ▁was ▁seized ▁on ▁ 1 5 ▁December ▁ 1 9 9 0 . ▁The ▁Colomb ian ▁government ▁argued ▁that ▁the ▁attack ▁was ▁caused ▁by ▁the ▁F AR C – EP ' s ▁lack ▁of ▁commit ment ▁to ▁the ▁process , ▁demonstrated ▁by ▁continu ing ▁its ▁criminal ▁activities ▁and ▁F AR C ▁attacks ▁in ▁November . ▁ ▁On ▁ 3 ▁June ▁ 1 9 9 1 , ▁dialog ue ▁res umed ▁between ▁the ▁Sim ón ▁Bol í var ▁Gu err illa ▁Co ordin ating ▁Board ▁and ▁the ▁government ▁on ▁neutral ▁territory ▁in ▁Car ac as , ▁Venezuela ▁and ▁T lax cala , ▁Mexico . ▁However , ▁the ▁war ▁did ▁not ▁stop , ▁and ▁armed ▁attacks ▁by ▁both ▁sides ▁continued . ▁The ▁neg ot iation ▁process ▁was ▁broken ▁off ▁in ▁ 1 9 9 3 ▁after ▁no ▁agreement ▁was ▁reached . ▁The ▁Co ordin ating ▁Board ▁disappeared ▁not ▁long ▁after ▁that ▁time , ▁and ▁gu err illa ▁groups ▁continued ▁their ▁activities ▁independently . ▁ ▁Before ▁the ▁break ▁off ▁of ▁dialog ue , ▁a ▁letter ▁written ▁by ▁a ▁group ▁of ▁Colomb ian ▁intellect uals