A Pennsylvania girl doused school security guards with gasoline and then attempted to light the victims on fire, according to investigators who have charged the teen with numerous felonies.In retaliation for a run-in last week with a guard, Imani Knight-Brantley, 16, returned Monday to her Pittsburgh-area high school carrying a two-liter Sprite bottle containing gasoline. According to police, Knight-Brantley was booted from Wilkinsburg High School Friday after being caught using a cell phone in class. She later returned to get food at an after-school program, but was again escorted from the building by guard Brandon Murray. As she was being...