Investigators are reviewing surveillance video along North Broad Street after a group of about 300 teenagers crowded the area Sunday night. It’s not clear why the large group descended onto Broad Street at around 7:30 p.m. Police are looking to identify a small fraction of the kids; those who were fighting and damaging property inside a Wendy’s fast-food restaurant near the Liacouras Center and one other business, flipping over tables and chairs. […] Police are reviewing social media to determine if this was a planned meet-up. Police Commissioner Richard Ross says often times investigators can stop social media meet-ups before...