DEIR AL-BALAH, Gaza Strip: Israeli aircraft struck a sprawling tent camp housing displaced Palestinians in Gaza on Wednesday, killing at least 21 people, according to a local health official, setting off fires in the coastal tent city that Israel has designated a humanitarian zone but which has been repeatedly targeted. The Israeli military said it struck senior Hamas militants “involved in terrorist activities” in the area, without providing additional details, and said it took precautions to minimize harm to civilians.