Chained upside down and burned alive: ISIS forces four Iraqi Shia prisoners to watch flames inch toward them in latest horrific killing

• Four Iraqi men are accused of spying for the Shi'a resistance against ISIS
• The men are forced to wear orange boiler suits and are chained up
• They are forced to watch as a trail of petrol is lit and heads towards them
• The horrific video shows the men being burnt alive in Anbar, Iraq 
• ISIS have burnt to death four Iraqi men by chaining them upside down and setting fire to a trail of petrol that engulfed them in flames.
  The four men, who are chained around their wrists and ankles, are forced to watch as the flames lick towards them after a  masked ISIS militant used a large torch to set fire to them.
  It is the latest horrific propaganda video to be released by the brutal jihadi group.
  

  +9

  Horrific: The four men were strung up by metal chains and forced to wait for their agonising death
  

  +9

  Terrible: The prisoners' orange boiler suits appear to be soaked in fuel prior to their deaths
  Forced to wear orange boiler suits, the four prisoners each introduce themselves to the camera, giving their names and a brief description of their role in fighting ISIS.
  Underneath the men, a line of fuel has been poured and slight patches of straw have been added in preparation for the flames.

  The final few seconds of footage are too graphic to publish as the men are agonisingly burnt to death by the flames. 

  Prior to their deaths, the prisoners are made to watch several videos showing the mutilation of the bodies of dead ISIS fighters by members of the Iraqi army and allied Shi'a militias.
  

  +9

  Final moments: The flames race through the fuel towards the men and horrifically burn them to death
  

  +9

  Victims: All four men are shown at the beginning of the video, where they introduce themselves to the camera
  

  +9

  Painful: The victims were forced to watch videos of Shi'a paramilitary forces burning ISIS corpses
  

  

  

  

  All four prisoners are Shia Muslims and are accused with siding with the Iranian backed Shiite militias
  

  +9

  No escape: Each of the men are led into the desert by an ISIS militant, dressed all in black uniform
  

  +9

  Final moments: The men were forced to bend low as they march towards the site where they will be put to death
  One video shows the corpse of a dead jihadi hanging upside down as several soldiers, thought to be members of the Iraqi army, watch as the body is set on fire. 
  The prisoners are also shown footage of Abu Azrael hacking the flesh off the body of a charred ISIS fighter.
  Known by the nom de guerre Abu Azrael, Ayyub al-Rubaie is the well known poster boy of the Imam Ali Brigade, an Iranian backed brigade fighting with the Iraqi army against ISIS. 
  He is shown using a large sword to carve at the dead body and turns to the camera, saying: 'ISIS this will be your fate, we will cut you like shawarma.'
  

  +9

  Masked militants stand behind the prisoners as the leader of the group announces their crimes
  

  +9

  Wearing all black, one of the militants uses a torch to set fire to a trail of fuel leading to the men's death
  
  
•