Metro Nashville Police said that they found possible human remains at the explosion site and that the motive behind the incident is still unclear. “We have tissue that we believe could be [human] remains and we’ll just have that examined,” Chief of Police John Drake told reporters during a press conference on Friday afternoon. He didn’t elaborate on where the possible human remains were found. He said police officers arrived before the explosion happened and found a dire message being broadcast from the now-exploded RV about 15 minutes prior to the blast. The officers were able to evacuate the area successfully. “They heard an RV giving out a message, basically saying that it was going to detonate within a certain timeframe,” he said. “Officers immediately began knocking on doors evacuating residents here, not knowing that the bomb was going to detonate immediately, or if it’s going to go off to …