Chicago officials agree that a federal crackdown on immigration is imminent. Saturday kicked off a week-long celebration of Mexican Independence Day. CBS News Chicago's Jermont Terry reports. Wall Street took hits on the market after hiring slumped in August. The economy added 22,000 jobs, far below expectations, fueling fresh concerns about a slowdown. Nikole Killion has more details. Israel has urged the residents of Gaza City to evacuate as it prepares for a full-scale military assault. Leaflets dropped from the sky telling residents of the famine-stricken area to leave. Haley Ott reports. Saturday's Powerball jackpot soared to $1.8 billion, making it the second-largest jackpot in history. One town north of Los Angeles is looking for a little luck after a devastating year. Elise Preston has the story from Altadena. Aryna Sabalenka has done it again. The world's number one women's tennis player defeated American Amanda Anisimova, 6-3, 7-6, to become the first back-to-back U.S. Open winner since Serena Williams. This school year, more states are moving to limit cell phones in the classroom. It's happening as new data reveals that ⅔ of Americans believe all-day bans would boost grades, social skills and behavior. Skyler Henry has more from a school in Atlanta. Flash mobs started as a playful social experiment in the early 2000s. A new movement sweeping the globe is urban sketching, like a flash mob with pencils. Itay Hod has the story.