The 55-minute 'Flames of War' video was posted online today and bears hallmarks of previous Islamic State tapes including Hollywood-style effects and bloodthirsty, call-to-arms language.The clip bears the stamp of the al-Hayat Media Centre, ISIS' English-language propaganda arm.A male voice in well-spoken English with a non-specific American accent provides the voice-over, using dialogue seemingly hijacked from a blockbuster action film.He says: 'In the face of the dark wave of the crusader force, the historical land of two rivers bore life to a mission that would transform the political landscape of the world.'Almost an hour follows of battle scenes where militants wield rocket launchers, the footage manipulated with special effects. Piles of bloodied corpses are spliced with speeches by President Obama and former president George W Bush.The tape builds to shaky camera footage of the extremists' raid on the 17th Division air force base in Raqqa, Syria under the cover of darkness.In the final minutes of the tape, a masked jihadist in desert fatigues, speaks directly to camera in a different American accent to the man who provided the voice-over. An ISIS flag billows as Syrian soldiers, loyal to dictator Bashar al-Assad, dig their own shallow shallow graves in the sand.In a deep voice, the ISIS militant, who appears tall and well-built, speaks first in Arabic before transitioning into fluent, well-spoken English to deliver a chilling message.He said: 'We're here in the 17th division military base just outside the city of Raqqa.'We're here with the soldiers of Bashar, you can see them now digging their own graves where they were stationed. The very place they were stationed, terrorizing the Muslims in Raqqa.He goes on to say that the work of Allah will be carried out on the soldiers by the mujahideen who captured them. 'This is the end that they face,' he said, gesturing to the men digging in the sand. The tape then cuts to a captured soldier holding a shovel in a pit who says: 'Today we're digging our graves with our own hands... Our fate is to be slaughtered.'He said that ISIS with just a few dozen soldiers were able to take over the 800-strong Syrian army base.(dailymail.co.uk)Bakudaily.Az