U.S. sees 13 mass shootings over one weekend
Dozens of people were hurt and many were killed in mass shootings across the U.S. over the weekend. CBS News national correspondent Jericka Duncan reports from Philadelphia, where one official is calling for reform after three were killed in a shootout in the city's business district. Then, CBS News' Anne-Marie Green and Vladimir Duthiers spoke with CBS News Philly's Ross DiMattei about what the community wants to see done about the violence.