It began with a crush, police said, and turned into one of the most shocking crimes in Milwaukee's long, violent summer: an 11-year-old girl was sexually assaulted by as many as 20 boys while a 16-year-old girl she was romantically interested in watched and coached her. The 16-year-old and a 15-year-old boy have been charged in juvenile court in the alleged attack, which authorities said took place Monday in a house on the city's north side. The teenage girl's 40-year-old uncle might also be charged, authorities said. The youth's names were not released because of their ages. Investigators are still...