Israeli soldiers killed three guerrillas early Friday in Israel's self-declared "security zone" in southern Lebanon, and the army imposed curfews on Gaza Strip refugee camps to prevent violence during a strike to commemorate Palestinians slain in Lebanon. The underground committee directing the 9-month-old uprising asked Palestinians to strike Saturday in the Israeli-occupied Gaza Strip and West Bank in remembrance of the 1982 massacre of hundreds of Palestinians at the Sabra and Shatila refugee camps in Lebanon.