Firefighters attempt to put out a fire at an abandoned building with the protection of St. Louis City Police in St. Louis, Missouri August 19, 2015. According to eyewitness, protesters demonstrating against a police shooting earlier in the day in St. Louis set the building on fire. St. Louis police fatally shot a black teenager on Wednesday who they say pointed a gun at them, and later faced angry crowds, reigniting racial tensions first sparked by the killing of an unarmed black teen in another Missouri town a year ago. REUTERS/Lawrence Bryant TPX IMAGES OF THE DAY