Chaos. As millions are set to expire this weekend, the american president is golfing. Live from cnn World Headquarters in atlanta, welcome to all of you watching here in the United States, canada and around the world. This is cnn newsroom. Authorities in nashville, tennessee, are examining what could be human remains after the explosion downtown. All signs point to the blast being intentional. The mayor called it a deliberate bomb that was planted in a recreational vehicle. Video captured the moments before the explosion. If you can hear this message, evacuate now. If you can hear this message, evacuate now. So as you heard a recorded countdown warned people to evacuate the area before the explosion. It came from inside this white rv which had entered the area a few hours earlier. Police havent announced any suspects so far, nor has any person or groups claimed responsibility. Tasha explains what we do know at this point. Much of downtown nashville is under a curfew that began the afte