I always wonder why people think there would be gangs.
Imagine in this scenario, 99% of people die instantly. That leaves 10m people alive, they wouldnt all be clustered together, unless it was some weird coincidence.
195 countries / 10m = 51282 people per country.
UK survey says there's 112 major populated towns and cities, so that's not counting villages and low populate places.
That's still 457 people per city. That's less than 1 person per square mile in London.
It's less than a football stadium full of people spread out across the whole country, and ours is quite a small one, you'd probably go unnoticed, in the USA you'd barely find anyone..
If it wasn't even distribution of deaths either then London isn't even in the top 20 most populated cities on earth, so the 1% would be broken up into countries..
China and India make up like 40% of the world population, they get 4m, that 6m broken up around the next 20 or so countries, the UK would be bottom of that list getting about 2%. At most there would a few 100k in the whole country.