Outgoing Head of the FBI Says He Fears Another 9/11

Robert Mueller says Arab Spring has created "violent extremists"

The outgoing head of the FBI fears another 9/11-style attack on the US, saying the fallout from the Arab Spring has bred a number of "violent extremists".

Robert Mueller, who leaves his post on September 4, said that he fears terrorists will target planes, or attack America using a weapon of mass destruction.

He warned that the US does not have the capability to defend a cyberattack on the country's energy sector.