Nashville police were able to usher people to safety before an explosion rocked downtown Nashville on Christmas morning in what authorities are calling a deliberate act, while a warning message was broadcast urging people to evacuate moments before the blast. Officers with the Metro Nashville Police Department carried out door-to-door and apartment-to-apartment checks and managed to get people to safety shortly before the blast, according to statements made at a press conference. There was a loudspeaker warning people to clear the area before the massive blast, according to a Metro Nashville Police spokesperson and surveillance footage. “All buildings in this area must be evacuated now,” a voice could be heard in the video. “If you can hear this message, evacuate now,” the warning continued, before the blast occurred. The explosion shattered windows, damaged buildings, and wounded three civilians. One officer was knocked down to the ground by the explosion, while another …