An 18-year-old Maine man and two other teens, one in Chicago and another in Kentucky, conspired to attack a Chicago mosque with homemade explosives this month, new court documents reveal - until the FBI unraveled the plot. The teens, agents said, concocted a scheme to massacre worshippers at the Shia mosque in the name of ISIS. The recently unsealed federal filing alleges that Xavier Pelkey of Waterville and two teens, who were not named in court papers because they are juveniles, communicated through Instagram and other platforms to plot the attack. They planned to convene in the Windy City for...