The Israeli military killed at least 39 Palestinians in strikes across the Gaza Strip overnight, medics said on Thursday, including at least 20 in an attack that set ablaze tents sheltering displaced families in a crowded camp. Residents carried a body wrapped in carpets out of the charred wreckage of the makeshift shelters in Mawasi, near the beach west of Khan Younis in southern Gaza, where tens of thousands of people have sheltered for months. Israel calls the area a humanitarian zone and has long told people to go there for their safety.