Authorities on Friday said investigators have uncovered what could be possible human remains after a vehicle explosion rocked Nashville, Tennessee, on Christmas morning.

In what police say may have been a quote intentional act, Nashville Police chief John Drake Way have found tissue that we believe could be remains.

Police had earlier said it was uncertain whether anyone was inside the recreational vehicle when it exploded.

The park to motor home exploded in downtown Nashville early Friday morning, minutes after a recorded announcement emanating from the vehicle warned of a bomb.

The recorded voice warning, shared widely on social media, said Quote.

This area must be evacuated now if you can hear this message, evacuate now.

Buildings were destroyed and at least three people were injured in the explosion.

Police reported seeing the vehicle and hearing the warning when they responded to an emergency call of shots fired in the downtown tourist area.

Officers quickly went door to door in nearby buildings to hustle people to safety and called in the bomb squad, which was on its way to the scene when the vehicle blew up.