Investigators tread carefully at charred Tennessee explosives plant as families of 16 blast victims learn of their loss

The families of 16 victims killed in a devastating blast at a Tennessee explosives plant have been notified of their loss, as investigators methodically work to clear the scene and gather evidence to determine what caused the tragedy in the tight-knit community.

​ The families of 16 victims killed in a devastating blast at a Tennessee explosives plant have been notified of their loss, as investigators methodically work to clear the scene and gather evidence to determine what caused the tragedy in the tight-knit community. Read More Breaking News, Latest News and Videos | CNN