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Islamic State of Iraq and the Levant has released new footage from its deadliest massacre, showing executions on an industrial scale at a military base following its attack near the Iraqi city of Tikrit last year.

The footage shows young army conscripts falling off the back of trucks at Speicher military base and later lying ready to be shot in pits or at the edge of the Tigris. At times, the water runs red with blood.

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The soldiers are lined up in their hundreds and shot in shallow graves. The highest estimates put the number of dead at 1,700, most of whom were Shia. At one point, the video shows an excavator being used to move piles of bodies.

ISIL’s capture of the Speicher base and nearby Tikrit took place during its lightning sweep across Iraq in June 2014. Government forces and allied Shia militia were only able to begin exhuming bodies in April, after a long fight to dislodge ISIL militants from Tikrit.