Palestinian Civil Defence workers search for survivors amidst the rubble of a building destroyed in an Israeli air strike, in Gaza City, on July 21, 2014. The UN Security Council called for an "immediate ceasefire" as Israel pressed on with a blistering assault on Gaza on Monday taking the Palestinian death toll above 500. AFP PHOTO / MAHMUD HAMS        (Photo credit should read MAHMUD HAMS/AFP/Getty Images)