The entire city entered a chaotic moment, with the exit of cars from the city being completely prohibited. Other cars could be allowed to enter into the city, but leaving the city was completely impossible.
The police within the city cooperated, blocking all the roads that led out of the city. No matter who it was, no matter what reason it was, nobody was allowed to leave the city.
This immediately disrupted many businesses that required movement from one city to another, something that displeased many people. And of course, they went ahead to complain to the government, wanting to know the reason why the city was being locked down.
But you matter how much influence they possessed, despite how much pressure they exerted, they did not manage to learn the reason why the city was being locked down.