Downtown Nashville woke up Christmas morning to sound of an explosion. Local police say the blast happened at 6:30 a.m. Central time and suggested the blast was set off on purpose.

The downtown area is closed off. The local fire department reported three injuries, but nothing major.

Footage and pictures from the scene showed damage to surrounding buildings and smoke billowing from the site.

The motivation and precise circumstances behind the event remain unclear at press time.

Update – 6:34 p.m.: Surveillance footage showed the RV in question airing a broadcast. Fox 17 News cited sources who said that human remains were found near the vehicle. Police Department Chief John Drake said they found tissue that could be human remains. No deaths were announced.

[Screengrab via NewsChannel5]