ISIS making more than £600m-a-year' through looting and taxes and can bankroll terror campaign for years

Islamic State militant are reportedly making more than £600million annually and can fund its campaign of twisted terror activity and bloodshed for years to come, an investigation has found. the militant group makes close to $1billion each year - predominantly from looting, oil fields and taxes. Of its income, two-thirds is ploughed right back into its war machine while the rest of its income goes towards the day-to-day running of the territory it holds in Syria and Iraq. Their territory includes major cities Mosul and Raqqa.

The probe into ISIS finances comes as the organisation showed off new rockets and tanks in propaganda images. The investigation, by the Financial Times, claims ISIS is set up to continue its campaign of terror for three years.

Terrorists willing to fight for ISIS are broken into three 'ranks'.

These fighters have not pledged allegiance to Islamic State, and earn between £33 ($50) to £100 ($150) each month.

The Mubayeen fighters earn between £130 ($200) and £200 ($300) a month. They have pledged allegiance to Islamic State, and are seen as the mid-ranking fighters.

On average, the Muhajireen militants are paid £400 ($600) a month. However this can go as high as £650 ($1,000).

Muhajireen fighters are predominantly foreign fighters who may have a military background after serving in neighbouring countries.