No survivors found after blast at Tennessee explosives factory, sheriff says

Smoke fills the air as debris covers the ground and vehicles after a powerful blast ripped through a plant in Tennessee (WTVF-TV via AP)

A blast in the US state of Tennessee that levelled an explosives plant and was felt for miles around left no survivors, authorities said.

The total number of dead was unclear, as was the cause of the blast on Friday. By the weekend the devastation came into focus, with officials saying they had found no survivors.