Here's where terrorist groups like ISIS and Al Qaeda get all their money from

One of the biggest challenges posed by ISIS (also known as ISIL, the Islamic State, and Daesh) is just how well funded the group is, pulling in hundreds of millions every year.

A report assessing the UK's risk of money laundering and terrorist financing released by the government earlier this year spells out clearly just how groups like ISIS, Al Qaeda, Al Shabaab, and Boko Haram raise the money needed to operate a terrorist group.

We've rounded up all the ways terrorists finance their activities below, drawing on the report and other investigations, and ranked them based on how profitable each activity is estimated to be.