What does that "is a jihad" mean?
Do YOU know what jihad means? The real reason and not the extremist, take-and-remake-the-word version of it?
Also, do you mean Muslim as religion or people of Arabic decent?
Lastly, if you compare Muslim numbers to both Tokyo and London, well...
In the 2011 Census - there were 1,012,823 Muslims in London, that being 12.39% of the population (roughly 8,173,941 people). Of course that number has gone up but census data is only taken every ten years.
In 2010, the Pew Research Center estimated only 185,000 in ALL of Japan.
Ergo, there IS no comparing the two cities. Or their Muslim communities. Or even the cities themselves as Japan's culture is nowhere NEAR that of England.
Considering how intense the Japanese watch Muslims in their country (there are articles on it), extremism in Japan doesn't happen because the Government there is super paranoid of it.
But terrorist activities HAVE happened in Tokyo before.
Just not Muslim terrorism.
So technically Khan is right, terrorism is part and parcel of living in a big city.