Fighting has erupted in a refugee camp in the northern occupied West Bank between Palestinians and their own security forces. Palestinian authorities say a 25-year-old Palestinian was killed. The unrest on Wednesday underscored the challenges facing Palestinian police trying to reassert order in the restive territory. Meanwhile, a suspected Palestinian assailant stabbed an Israeli man in Jerusalem, moderately wounding him before police shot and killed the attacker. Elsewhere in the West Bank, Israeli security forces shot a Palestinian man who they said tried to ram his car into soldiers at a military checkpoint, lightly wounding a soldier. The incidents were the latest escalations in one of the area's most violent phases in years.