West Bank ? Visiting U.N. chief Ban Ki-moon said Saturday that Israeli settlement building anywhere on occupied land is illegal and must be stopped, while a Palestinian teenager was killed in clashes with Israeli troops elsewhere in the West Bank.

The death of 16-year-old Mohammed Qadus, who Palestinians say was shot in the chest by Israeli security forces, comes amid heightened tensions between Israelis and Palestinians after Israel announced plans last week for 1,600 new homes for Jews in disputed east Jerusalem.

The settlement announcement has sparked outrage and protests from Palestinians, as well as condemnation from Israel’s closest ally — the United States — and the U.N. secretary general.