The Pentagon has said US airstrikes killed the red-bearded ISIS minister of war.

Officials confirmed Abu Omar al-Shishani - also known as 'Omar the Chechen' - has died from injuries sustained in an attack on March 4.

A vehicle convoy believed to be carrying the jihadist was targeted by a coalition bombing raid near al-Shadadi

Red-bearded Shishani - known as 'Omar the Chechen' - is among the most wanted terrorists in the world and the U.S. had offered a $5million reward for information leading to his capture.

Abu Omar al-Shishani was killed in a coalition bombing raid near the town of al-Shadadi on Friday, but his fate is not yet known, several U.S. officials revealed today

Red-bearded Shishani - known as 'Omar the Chechen' - was among the most wanted terrorists in the world and had a $5million bounty on his head

'We believe he subsequently died of his injuries,' Navy Captain Jeff Davis, a Pentagon spokesman, told AFP.

On Sunday, the Syrian Observatory for Human Rights monitoring group said Shishani had been 'clinically dead' for several days.

Two U.S. military officials were optimistic that Shishani had been killed but admitted it was not certain. A third source said Shishani was targeted but gave no further information.

The reports now appear to confirm the target is dead.

The town of al-Shadadi recently fell to U.S.-backed forces from the Syrian Arab Coalition after months of ISIS control.

Shishani had previously been pictured with ISIS butcher Jihadi John - who was taken out in another airstrike last year - and is believed to have originally recruited him.

The Georgian is also a close military adviser to the terror group's commander Abu Bakr al-Baghdadi.

Shishani (right) has previously been pictured with ISIS butcher Jihadi John (believed to be center) - who was taken out in another airstrike last year - and is believed to have originally recruited him

In January 2015, the barbaric militant appeared in a chilling set of images that showed him smiling in front of a burning Big Ben in London

Infamous: Abu Omar al-Shishani (right) is pictured here with Ibrahim al-Mazwagi (center), the first British jihadi known to have died in Syria

Shishani, 30, leads a brigade of foreign fighters responsible for a series of beheadings and operations involving suicide bombers in northern Syria.

Some estimates suggest he commands an army of more than 1,000 Islamists.

Shishani - real name Takhan Tayumurazoch Batirashvili - had been targeted in a number of strikes.

On more than once occasion, he had been reported dead or captured before re-appearing in ISIS propaganda videos.

In January 2015, the barbaric militant appeared in a chilling set of images that showed different landmarks across the Western world burning while flying the black flag of ISIS.

One showed the Capitol in Washington, DC, ablaze as ISIS militant marched through the city.

Another, featuring Shishani, showed the red-bearded terrorist smiling in front of a burning Big Ben in London.