NEW : Doctor : Some 20 percent of the 500 people dead at hospital are Palestinians . NEW : At least 100 Palestinians have been killed in the military operation . Gaza 's main hospital , already overloaded with Palestinians wounded in the week-long Israeli air assault , has reached critical mass , according to a Norwegian doctor volunteering at Shifa Hospital . Doctor : ` ` people were dying before they got treatment '' Some 25 people bearing aid could not cross the Gaza - Egypt border on Sunday .
NEW : Doctor : Some 20 percent of the 500 people dead at hospital are Palestinians . NEW : At least 100 Palestinians have been killed in the military operation . Doctor : ` ` people were dying before they got treatment '' Some 25 people bearing aid could not cross the Gaza - Egypt border on Sunday .