For those initially unaware of the danger, or stuck deep inside the dark venue, chances of escape rapidly diminished.

BBC: Eyewitness: Kiss night club fire in Santa Maria, Brazil

They continued to drink and dance, unaware of the danger spreading above them.

NPR: No Alarm, Only 1 Exit In Brazil Nightclub Fire

Hundreds of thousands of other HIV-positive Americans remain unaware of their infection or have simply given up and are not seeking or receiving medical attention, at grave danger to themselves and others.

WHITEHOUSE: Winning the Battle Against HIV/AIDS