The six victims are in their 20s and 30s, and all have extensive burns, according to Dr. Kevin Foster, director of the Arizona Burn Center.

Six survivors of a massive fireworks explosion in Hawaii have been flown to Phoenix for treatment. This comes as we're learning a three-year-old boy died on Monday as a result of the blast, raising the death toll to four.

Honolulu mayor Rick Blangiardi said in a statement that the explosion was "caused by what appears to be illegal fireworks"