An alleged Mossad spy --- an Israeli Arab --- was seen being executed by a 12-year-old child in a new video uploaded by the Islamic State of Iraq and Syria (ISIS).

The 13-minute video clip, which was released via the ISIS Twitter account on Tuesday, shows Muhammad Said Ismail Musallam, 19, confessing that he was recruited by the spy agency of the Jewish state. However, his family said that he is not a spy because he joined the ISIS willingly.

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The Jewish state has yet to comment on the claims of the alleged spy.

The child killer shouted "Allahu Akbar" before killing the alleged spy with four gunshots. This is the second time that a kid was seen in a video executing their captives. In January, two Russian spies were also killed by a boy.

According to Veryan Khan, a Terrorism Research and Analysis Consortium, the use of a child executioner in the video demonstrates that ISIS has a growing caliphate and that the group is raising its next generation warriors called "cubs" who are being trained by older militants.

The latest video threatened specific Mossad agents who are in a hit list and even mentioned their addresses.

Musallam, who was originally from East Jerusalem, was interviewed last month by the ISIS online magazine Dabiq. In its February edition, Musallam explained that he was recruited by his neighbor who is a police officer.

Musallam also shared that his brother and father encouraged him to be a spy. He added that he was motivated to do it because of the lure of money and opportunity to advance to higher ranks.

The teenager shares that Mossad asked him to infiltrate ISIS and obtain information about its bases, weapons and the identities of the militants.

Musallam revealed in the interview that he was caught by the militants because he acted in a different way than the typical militants. The alleged Mossad spy might have been executed because he tried to flee the group and go home.

TagsISIS, Mossad spy, child executionist, Muhammad Said Ismail Musallam, Islamic State video