NEW : Doctor : Some 20 percent of the 500 people dead at hospital are children . Comment: : About 10 truckloads of donations from Saudi Arabia , Qatar , Turkey and Greece crossed into Gaza on Saturday . At least 507 Palestinians have been killed in the military operation . Doctor : `` people were dying before they got treatment '' Some 25 trucks bearing aid could not cross the Gaza-Egypt border on Sunday .
NEW : Doctor : Some 20 percent of the 500 people dead at hospital are children . Comment: : At least 507 Palestinians have been killed in the military operation . Doctor : `` people were dying before they got treatment '' Some 25 trucks bearing aid could not cross the Gaza-Egypt border on Sunday .