The Israeli military ordered more evacuations in southern Gaza early Sunday after a deadly airstrike on a school-turned-shelter in the north killed at least 80 Palestinians, according to local health authorities. Israel said it targeted a militant command post, killing at least 19 fighters.

Israel has repeatedly ordered mass evacuations as its troops have returned to heavily destroyed areas where they had previously battled Palestinian militants. The vast majority of Gaza’s population of 2.3 million people have been displaced by the 10-month old war.