▁Imperial ▁on ▁ 4 ▁December . ▁The ▁heav iest ▁bomb ard ment ▁of ▁the ▁Old ▁Town ▁started ▁at ▁ 5 : 4 8   am ▁on ▁ 6 ▁December . ▁The ▁Old ▁Town ▁was ▁struck ▁by ▁ 4 8 ▁ ▁miss iles , ▁ 2 3 2 ▁ ▁and ▁ 3 6 4 ▁ ▁mort ar ▁shell s , ▁as ▁well ▁as ▁ 2 2 ▁wire - gu ided ▁miss iles . ▁Two ▁impact ▁cr aters ▁indicated ▁the ▁use ▁of ▁heav ier ▁weapons . ▁The ▁bomb ard ment ▁was ▁concentr ated ▁on ▁Str ad un — the ▁central ▁prom en ade ▁of ▁the ▁Old ▁Town — and ▁areas ▁north - east ▁of ▁Str ad un , ▁while ▁other ▁parts ▁of ▁the ▁Old ▁Town ▁sust ained ▁relatively ▁few ▁impact s . ▁The ▁attack ▁subs ided ▁at ▁ 1 1 : 3 0   am . ▁It ▁killed ▁ 1 3 ▁civil ian st he ▁heav iest ▁loss ▁of ▁civil ian ▁life ▁during ▁the ▁sie ge . ▁The ▁Dub rov nik ▁Inter - Univers ity ▁Centre ▁library ▁containing ▁ 2 0 , 0 0 0 ▁volumes ▁was ▁also ▁destroyed ▁in ▁the ▁attack ▁and ▁the ▁Libert as ▁Hotel ▁was ▁bomb arded ▁by ▁J NA ▁art illery ▁aim ing ▁to ▁kill ▁fire fig h ters ▁putting ▁out ▁fires ▁caused ▁by ▁an ▁attack ▁earlier ▁that ▁day . ▁The ▁ 6 ▁December ▁attack ▁of ▁the ▁Old ▁Town ▁was ▁met ▁with ▁strong ▁protest s ▁from ▁the ▁international ▁media , ▁UN ES CO ▁Director - General ▁Feder ico ▁Mayor ▁Zar ago