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ISIS terrorists are asking doctors to give them sick notes to get out of fighting on the front line, it has been claimed.

The jihadists are reportedly struggling to keep fighter morale up as the group struggles to deal with territory losses, military pressure, financial problems and poor management.

Now some militants are so disillusioned they are looking for any way they can to get out of the fighting, according to a report by the US military's think tank the Center for Combating Terrorism (CTC).

It wrote: "This was reflected on a wider level when the Islamic State issued a general amnesty for deserters at the beginning of October 2015.

"The personnel shortages were also evidenced by an Islamic State document that emerged last year.

"Issued in Deir ez-Zor province in eastern Syria, the document indicates that a number of Islamic State members had been seeking false medical reports from doctors in order to avoid frontline duty."

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Much of the terror group's problems with personnel stem from their inability to pay wages.

(Image: Reuters)

The CTC report adds: "The reasons for financial strain on the Islamic State overlap to a degree with the causes of problems of cohesion in the Islamic State’s ranks, such as reduced border access to Turkey, tougher border policies, and coalition airstrikes.

"These strikes have most recently targeted Islamic State “cash storage” points and the oil industry."

They have been forced to slash their fighter's wages - and many have quit in disgust at their treatment.

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Earlier this year it was reported that ISIS has been forced to cut the salaries of its murderous fighters by HALF.

Fighters now get the equivalent of just £100 a month because of "exceptional circumstances”, according to a document released by Bayt al-Mal, the Treasury Ministry of ISIS.

Islamic State is feeling the pinch because it recently lost Ramadi and other territories in Iraq.

On January 13, the international coalition bombed the central headquarters of Bayt al-Mal in Mosul, destroying millions of dollars stored there.

Afterwards, ISIS’ governor in Mosul issued a fatwa that permits ISIS killers to extort money from locals.