The blast that killed 16 people at a Tennessee workplace set off 24,000 pounds of explosives, authorities say

The catastrophe at a Tennessee explosives plant started in a building that made devices used for mining and detonated more than 24,000 pounds of explosives, authorities said Friday.

​ The catastrophe at a Tennessee explosives plant started in a building that made devices used for mining and detonated more than 24,000 pounds of explosives, authorities said Friday. Read More Breaking News, Latest News and Videos | CNN