Interesting what a Californian Senator had to say this week:
Feinstein attributed the growing threat in part to improved weaponry.
"There are new bombs, very big bombs, trucks being reinforced for those bombs," she said.
Though neither lawmaker offered specifics about what led them to their conclusions, Feinstein spoke generally of "a real displaced aggression in this very fundamentalist jihadist Islamic community, and that is that the West is responsible for everything that goes wrong and that the only thing that's going to solve this is Islamic Shariah law and the concept of the caliphate."
The caliphate is an Islamic state led by a religious and political leader, or caliph, considered a successor of the Prophet Muhammad and who governs by Shariah law.
The Associated Press contributed to this report.