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ISIS has confirmed a senior commander has been killed - four months after America reported his death.

Amaq Agency, mouthpiece of Islamic State says Abu Omar al-Shishani, also known as Omar the Chechen, has been killed.

It is thought he may have died in recent US airstrikes, according to American media reports.

The pentagon is trying to verify whether one of their recent attacks killed the commander, according to CNN.

Born in 1986 in Georgia, which was then still part of the Soviet Union, the red-bearded Shishani had a reputation as a top military adviser to ISIS leader Abu Bakr al-Baghdadi.

It is not the first time al-Shishan has been reported as being killed - but this is the first time the jihadis have confirmed his death.

Born with the name Tarkhan Tayumurazovich Batirashvili, Shishani once fought in military operations as a rebel in Chechnya before joining Georgia's military in 2006.

He even fought against Russian troops before being discharged two years later for medical reasons, US officials said.

(Image: Twitter)

He was arrested in 2010 for weapons possession and spent more than a year in jail, before leaving Georgia in 2012 for Istanbul and then later to Syria, the official said.

He decided to join Islamic State the following year and pledged his allegiance to Baghdadi.

The State Department said Shishani was identified as Islamic State's military commander in a video distributed by the group in 2014.

The strike would be one of the most successful operations to take out Islamic State's leadership in Iraq and Syria since May, when US special operations forces killed the man who directed the group's oil, gas and financial operations.