▁two ▁faces : ▁more ▁peace ful ▁during ▁the ▁day ▁and ▁more ▁violent ▁at ▁night . ▁About ▁ 2 0 0 ▁protest ors ▁required ▁hospital ▁treatment . ▁ ▁Result ing ▁in ▁over ▁ 2 0 0 ▁inj uries ▁and ▁over ▁ 1 , 0 0 0 ▁arr ests , ▁the ▁issue ▁had ▁far - re aching ▁effects , ▁including ▁a ▁large ▁out c ry ▁from ▁groups ▁philosoph ically ▁opposed ▁to ▁civil ▁dis ob ed ience . ▁▁ ▁" Pol ice ▁estimated ▁that ▁ 6 0 , 0 0 0 ▁people , ▁including ▁ 7 , 0 0 0 ▁mon ks ▁cl ad ▁in ▁gray ▁Buddh ist ▁gar b , ▁gathered ▁in ▁front ▁of ▁City ▁Hall ▁in ▁Se oul ." ▁ ▁Police ▁action ▁On ▁ 1 ▁June ▁ 2 0 0 8 , ▁police ▁took ▁action ▁to ▁control ▁demonstr ators . ▁B uses ▁and ▁sh ipping ▁containers ▁were ▁used ▁to ▁halt ▁the ▁progress ▁of ▁street ▁march es . ▁A ▁bar rier ▁of ▁sh ipping ▁containers ▁were ▁ere cted ▁across ▁Se j ong - Ro ▁to ▁stop ▁march ers ▁from ▁reaching ▁Che ong w ada e ▁( office ▁and ▁residence ▁of ▁the ▁president ). ▁The ▁protest ors ▁named ▁the ▁bar rier , ▁" My ung - b ak ' s ▁Fort ress " ▁and ▁decor ated ▁it ▁with ▁leaf lets ▁and ▁large ▁Korean ▁flags . ▁They ▁photograph ed ▁themselves ▁standing ▁on ▁the ▁bar rier . ▁It ▁was ▁dis m ant led ▁several ▁days ▁later ▁without ▁conflict . ▁Water ▁can n ons ▁were ▁used ▁to ▁suppress ▁protest