ISIS warlords have been living in fear of the brave sharpshooter as he waged a one-man war on jihadis in the under siege city of Mosul.

Mysterious death squads have been waging a secret war on ISIS throughout the occupation – taking out warlords in brazen gun attacks.

After residents dubbed him "The Sniper of Mosul”, the gunman struck again by rescuing a teenager from a monstrous jihadi execution with one fatal shot.

The deadly potential of snipers is highlighted as Russia produces a world record rifle which can take out targets up to three miles away.

**WHO IS THE SNIPER OF MOSUL?**

Sick jihadis had gathered for the execution of the teenage boy who was accused with supporting resistance movements within the city in Iraq.

As the executioner took aim to behead the boy, the sniper opened fire – blasting the monster and killing him.

Terrified terrorists began opening fire randomly after the sniper"s attack as they panicked, according to Al Sumaria News.

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As the Iraqi Army bears down the sniper is being heralded for increasing "popular resistance” against the death cult as the city looks on the verge of liberation.

Speculation was rife mysterious death squads operating in Mosul could be "special forces” such as the SAS or Navy SEALs.

Headquarters buildings were burned, and jihadis shot dead as they launched a campaign ahead of the army offensive on Mosul.

It comes as ISIS' own local assassin – nicknamed after the movie character "Rambo" – was confirmed dead by security chiefs.

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Iraqi news outlets reported the activities of the lone gunslinger – saying he had shot a "number” of fighters serving the cult.

However, they added there could be "many snipers” and not just the one.

Tragically, despite his executioner being killed by the sniper, the teen boy was shot by ISIS fighters before he could escape.

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Death squads waging a guerrilla war on ISIS have brazenly gunned down jihadis leaders in broad daylight shootings.

Women in burqas have also been part of their campaign, gunning down ISIS commanders at checkpoints using pistols hidden beneath their veils.

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The siege of Mosul is raging as Iraqi forces and their US-coalition allies launch a final assault to liberate the city.

Ministers warned a defeat in Mosul could send ISIS fighters streaming over Europe to the UK to carry out revenge attacks.