▁and ▁four ▁days ▁later , ▁Y ug oslav ia ▁capit ulated . ▁After wards , ▁Luft wa ffe ▁engine ers ▁conducted ▁a ▁bomb ▁damage ▁assess ment ▁in ▁Bel grade . ▁The ▁report ▁stated ▁that ▁ ▁of ▁bomb s ▁were ▁dropped , ▁ 1 0 ▁to ▁ 1 4 ▁percent ▁being ▁inc endi aries . ▁It ▁listed ▁all ▁the ▁targets ▁of ▁the ▁bomb ing , ▁mentioned ▁that ▁seven ▁aer ial ▁mines ▁were ▁dropped , ▁and ▁that ▁areas ▁in ▁the ▁centre ▁and ▁north - west ▁of ▁the ▁city ▁had ▁been ▁destroyed , ▁compr ising ▁ 2 0 ▁to ▁ 2 5 ▁percent ▁of ▁its ▁total ▁area . ▁Some ▁aspects ▁of ▁the ▁bomb ing ▁remain ▁un exp la ined , ▁particularly ▁the ▁use ▁of ▁the ▁aer ial ▁mines . ▁Sign ific ant ▁damage ▁was ▁done ▁to ▁Bel grade , ▁particularly ▁to ▁the ▁water ▁and ▁elect rical ▁systems . ▁Pav low itch ▁states ▁that ▁almost ▁ 5 0 ▁percent ▁of ▁housing ▁in ▁Bel grade ▁was ▁destroyed . ▁After ▁the ▁invasion , ▁the ▁Germ ans ▁forced ▁between ▁ 3 , 5 0 0 ▁and ▁ 4 , 0 0 0 ▁Jews ▁to ▁collect ▁rub ble ▁that ▁was ▁caused ▁by ▁the ▁bomb ing . ▁Une x pl oded ▁German ▁bomb s ▁continue ▁to ▁be ▁un ear th ed ▁in ▁the ▁ 2 1 st ▁century . ▁ ▁Lö hr ▁was ▁captured ▁by ▁the ▁Y ug oslav ▁Part is ans ▁on ▁ 9 ▁May ▁ 1 9 4 5 , ▁escaped , ▁and ▁was ▁re capt ured ▁on ▁ 1