Israeli troops fired a mortar shell over the ceasefire line into a Palestinian residential area in the Gaza Strip, in the latest incident threatening the fragile truce with Hamas. Health officials reported at least 10 people wounded, while the Israeli military said it is investigating the incident. The mortar was fired during an operation near the “Yellow Line,” which divides the Israeli-held majority of Gaza from the rest of the territory, though the army did not specify the intended target or whether troops crossed the line.