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.
Second, if indeed it was an ISIS-related attack, was this ISIS-inspired, like the attack last year at a gay nightclub in Orlando, Florida, by US citizen Omar Mateen in which he killed 49 people?
Or was it an ISIS-enabled operation, as was the unsuccessful attempt in 2015 to attack a Prophet Mohammad cartoon contest
in Garland, Texas? The two American terrorists in that attack were in encrypted communication with an ISIS militant in the Middle East who directed their efforts.
Or was it an operation in which ISIS had trained the terrorists, like the case of the 2015 Paris attacks that killed 130?
The low-tech nature of the London attacks on Saturday, in which the terrorists used a vehicle as a weapon and also wielded large knives, suggests it was ISIS-inspired rather than an attack in which ISIS had trained the perpetrators.
Third, how large is the conspiracy? From what we know so far there were three suspects involved. Were they part of a larger network or were they a self-contained cell?
Fourth, did the Muslim holy month of Ramadan play some role in sparking the London attacks? As I noted on Wednesday, the Ramadan period
that began just over a week ago, could see a surge in terrorist attacks, including in the West, because ISIS has specifically called for such attacks during this Ramadan and the group has, unfortunately, had a track record of inspiring such attacks.
Last year, for instance, ISIS called for attacks during Ramadan and one of those who answered that call was Omar Mateen who pledged allegiance to ISIS as he carried out the most lethal terrorist attack in the United States since 9/11 at the Orlando nightclub almost exactly a year ago.
Fifth, once the suspects are identified in the London attacks will they be known in some way to law enforcement? That is quite often the case. For instance, the suicide bomber who struck two weeks ago at the Ariana Grande concert in Manchester in northern England killing 22 was known
to the British security services.
So too was the terrorist
who rammed his car into pedestrians walking across London's Westminster bridge in March, killing 4.
Which raises the sixth question: After the third significant terrorist attack in three months in the United Kingdom, what will the political fallout be on the British general election to be held on Thursday, in particular if British voters feel that the government has failed in its primary duty to keep them safe?
Typically terrorist attacks produce a rally-around-the flag effect as was the case after 9/11 and the huge outpouring of public support that then-President George W. Bush garnered.
But in this case the British public may be concerned that there is an ongoing campaign of terror which their government has not adequately prevented. Will there be a political backlash against British Prime Minister Theresa May, whose ruling Conservative Party is traditionally seen as "stronger" on terrorism than its main rival, the Labour Party?
You only have to recall the terrorist attacks in Madrid, Spain, in 2004 -- in which 191 were killed only three days before the Spanish election -- to understand that an attack very late in an electoral cycle can have unexpected consequences. The sitting prime minister, Jose Aznar, who had strongly backed the US-led Iraq War, was unseated
by a challenger who then pulled Spanish troops out of Iraq. The Madrid terrorist attacks are generally regarded as being the key to why Aznar, who had been leading in the polls, was defeated.
Seventh: What to do? President Donald Trump tweeted shortly after the London attacks that his administration's proposed temporary travel ban aimed at six Muslim-majority countries should be instituted.
Right now, of course, that proposed ban is being held up in the courts. But the travel ban is a solution in search of a problem that doesn't exist. The perpetrators of these terrorist attacks in the West are largely second-generation homegrown terrorists, not recent immigrants or refugees.
The hard reality is that attacks by vehicles in public places are very hard to defend against in a free and open society.
The best defense against such attacks is good intelligence, and that often comes from inside the Muslim community. To gather that intelligence requires not alienating Muslims but encouraging them to flag to authorities those they see who are radicalizing or seem to be preparing some kind of an attack.
Correction: This piece originally said "After the third significant attack in four months..." It has been corrected to three months.