Many questions remain about the causes and circumstances that lead to the deadly explosion at the Givaudan Sense Colour factory on Tuesday afternoon in Louisville's Clifton neighborhood. The explosion killed two, injured 11 more and left numerous surrounding homes and businesses damaged.

A massive explosion this week at a food dye factory in Louisville, Kentucky, left two people dead and a dozen others injured as smoke billowed out of torn metal structures and rubble.

Two people are dead after a plant explosion in Louisville's Clifton neighborhood Tuesday afternoon. Here's what we know.