Question

why did the US force secretly picked up about 600 people from all over the world

Answer 1

According to the American Government, they were enemies of the US and linked to the attack on New York on 11th September, 2001. So, about 600 people were picked up by the US forces from all over the world.

Answer 2

The Twin Tower attack in USA shattered the government and US government wanted to find out the persons behind the attack.

As a course of investigation, US force secretly picked up 600 people from different countries and placed them in prison for investigation about the 11t September attack.

It was clearly anticipated that these people were the enemy of USA.