The jihadist organisation Islamic State has made it clear that it knows no limits when it comes to inflicting brutality on its enemies or to those who do not submit to their will, including even children.

An NBC News exclusive report recently detailed how the ISIS uses violence to build an army of children to become future terrorists and suicide bombers.

Fourteen-year-old Muhammed, for instance, used to work with Syrian rebels who fought the ISIS. When the extremist group took over eastern Syria, Muhammed went into hiding.

"I stayed at home for seven months. Later on, ISIS started arresting members of the Free (Syrian) Army. One of the detainees told them that I was also member," Muhammed said.

The young boy was eventually seized by ISIS militants and was locked in jail for two months, along with 75 other boys and men.

While imprisoned, Muhammed experienced torture in the hands of the terrorist groups. He said his torturers beat him with bats and applied electric shocks to his genitals.

"Many people died there. No water, no electricity. They provided water twice a day. We used the toilet once a day," the young boy recalled.

He was eventually released from prison, under the condition that he would go to the ISIS indoctrination school. However, realising that he would be used as a suicide bomber by the extremist group, he decided to escape with his friends.

Unfortunately, they were caught, because one of his friends turned him in.

Mohammed immediately was made to face an ISIS judge, who decided that he should be severely punished for choosing to leave the realm of "true Islam."

"He said to me 'This is the judgment of God. You were going to the land of the infidels... so you are like them. Your leg and arm must be cut off,'" the boy recalled.

In front of a cheering crowd, Muhammad's right hand and left leg were chopped off. He eventually managed to escape to Turkey, but he is disfigured for life.