Al Qaeda is biggest threat to US, not IS

Al Qaeda’s Yemen offshoot could bring down a transatlantic passenger plane at any time, a new book by a former CIA leader has warned.

The book also sheds light on the chaos in the immediate hours after the September 11 terrorist attacks on the US.

Despite the threat of Islamic State, it is al Qaeda in the Arabian Peninsula (AQAP) that poses the biggest threat, according to Michael Morell, the former deputy chief of the CIA.