Palestinian gunmen fired more than 30 mortar rounds at Jewish settlements in the Gaza Strip. There were no casualties, but the barrage threatens the cease-fire declared in Egypt two days ago by Israeli and Palestinian leaders. The Islamic terrorist group Hamas claimed responsibility, saying the attack was retaliation for Israel's killing of a suspected infiltrator near a Jewish settlement. In response, Israel cancelled a round of security talks with Palestinian negotiators, saying the Palestinian Authority is doing nothing to rein in terrorist groups.