Sick Islamic State terrorists have thrown up to 4,000 people in a giant 450-metre sinkhole-turned-mass grave in the desert of Iraq, it is claimed.
The so-called Khasfa pit is being used a massive grave for enemies of the terror group in a natural hole in the terrain just off the Baghdad-Mosul highway in Iraq.
Locals have reportedly revealed this week how convoys of buses full of "ISIS enemies" were driven into the desert before being executed and tossed in the pit.
In other cases, it is claimed vehicles were driven into the hole while fighters were alive.
When a farmer's boy fell into the sinkhole in 2003, locals says a 450-metre rope was not long enough to reach bottom, The Daily Beast reported.
The terror group began hunting down policemen and soldiers almost as soon as the city fell, and an orgy of killing ensued as it slaughtered anyone affiliated with government security forces.
It has been reported ISIS dumped the bodies of thousands of security personnel after they captured the city of Mosul in 2014.
In line with the terror group's infamous killing videos, the execution methods varied and sound terrifying when recalled by locals who live in nearby villages.
Witnesses claimed victims were shot and dumped in the pit or died in vehicles driven over the edge, The Daily Telegraph reports.
" Daesh would drive the victims to Khasfa in convoys of minibuses, trucks and pick ups," one man told the newspaper.
"The men had their hands bound and their eyes blindfolded."