Officials confirm likely cause of deadly Switzerland nightclub fire on New Year's Eve that killed at least 40 people.

Prosecutors suspect sparkler candles attached to champagne bottles ignited the ceiling, causing a rapid conflagration. The investigation is ongoing, focusing on negligence and flammable materials.

Sparklers may make for a Facebook worthy Fourth of July photo, but parents should remember to keep an eye on kids during and after they handle the pretty, but dangerous hand-held fireworks. The fiery ...