7 Questions About the London Terror Attacks

Peter Bergen wrote for CNN about the London terror attacks: 

The first question after the deadly London terror attacks Saturday is, of course: Who is responsible? British police have killed three suspects, but as yet there is no credible claim of responsibility for the attacks.

The vast majority of attacks and plots in the West in the past three years have been directed or inspired by ISIS.

That doesn't entirely preclude an al Qaeda-inspired plot. Three weeks ago Hamza bin Laden, one of Osama bin Laden's sons who has been playing a more prominent role in al Qaeda of late, issued a call for attacks on Westerners saying, "If you are able to pick up a firearm, well and good; if not, the options are many."

But, al Qaeda has not shown much ability to inspire or direct attacks in the West in recent years.