 That, according to the Gun Violence Archive, which says there were 20 mass shootings between July 1st through 7th. The worst in Chicago, Police Superintendent Larry Snelling. This is a societal issue. The police cannot be in everybody's backyard. They cannot be in everyone's home. They cannot invade every single gathering. In one Chicago shooting last week, an 8-year-old boy was killed. Matt Piper, CBS News.