The fact that casualties are from multiple nationalities showed how attractive London is as a tourists' destination.
But, it will also mean it's the best place for criminals to impact globally.
Speaking of which, Osaka used to be referred as a North Korean Missile-free city, because it's a city where Korean immigrants are most populated.
However, it has a potential to be a target of anti-Korean activists as well as anti-Japan activists.
How difficult it is to keep a good balance between global and terror-free.