"Don't move unless you want to die!"
"Don't move!"
"Stop crying!"
The three hijackers moved toward each other after they got their hostages. Meanwhile, the passengers who were still free converged toward the police.
Police rushed forward from three sides, protecting the passengers. At the same time, a group of police quickly divided the passengers into three groups — women and children, older men, and young men — in order to screen for more hijackers.
The chance of a hijacker hiding among women, children, and older men was slim. If there was a hijacker among them, he would be among the young men. Dividing the group was a good way to manage and monitor the crowd of people.
If there was a hijacker among the young men, there's a risk, but at least they minimized the risk. A young man who was a hijacker would be a lot more dangerous than an older man, a woman, or a child who was a hijacker.