Israeli forces and militants from Gaza resumed cross-border attacks after a three-day cease-fire ended at 8 a.m. local time.<br /><br />Talks mediated by Egypt failed to extend the 72-hour truce.<br /><br />The Israeli military launched air strikes after rockets were fired into southern Israel as the cease-fire ended.<br /><br />Palestinian officials said that a 10-year-old boy had been killed and several people wounded by an Israeli air strike in northern Gaza City.<br /><br />Local residents returned to UN shelters to seek refuge.<br /><br />At a UN school, Imada al-Attar said: “I feel safe here, I’m afraid to go back home. However, the Israelis have been shelling places near the school and the shrapnel has reached the school.”<br /><br />In Gaza City, worshippers gathered for Friday prayers at the ruins of a mosque recently hit by an air strike.