GAZA CITY, Palestine  Nearly 50 Palestinians were killed Thursday in an Israeli airstrike on a building opposite the headquarters of Kamal Adwan Hospital in the northern Gaza Strip, including three medical staff and workers. "There are nearly 50 martyrs, including three of our medical staff, under the rubble of a building opposite Kamal Adwan Hospital in the Beit Lahia Project area after it was bombed by Israeli warplanes,” Hussam Abu Safia, the hospital’s director, said in a statement. Abu