An Israeli airstrike in northern Gaza has killed at least 20 people, mostly women and children, Palestinian officials said Tuesday, as Israel wages a nearly month-long air and ground operation in what was already the most isolated and heavily destroyed part of the territory.

Several people were wounded in both attacks, they said, adding that Israeli forces had sent tanks into the northeast of Nuseirat camp earlier on Monday. Israel deployed tanks into Jabalia, Beit Hanoun,