EXCLUSIVE: Breathing in toxic dust caused by 9/11 sees terrorists' horrific death toll rise - 9,500 people have now been killed since September 2001

EXCLUSIVE: Breathing in toxic dust caused by 9/11 sees terrorists' horrific death toll rise - 9,500 people have now been killed since September 2001

Health conditions related to the 9/11 terrorist attacks in New York City are only now making themselves known, more than two decades later.