our north america correspondent nomia iqbal reports. they were once considered one of the most brutal terrorist organisations on the planet. the islamic state group, the self—declared caliphate, controlled huge parts of syria and iraq in 2014, claiming responsibility for acts of terror across the world, including the 2015 paris attacks. a group of men became infamous as part of is propaganda. the so—called beatles were given their nickname by their captives due to the fact all four were from the uk. they were a cell of is and filmed gruesome and horrific beheadings ofjournalists and aid workers on camera. the chief member was mohammed emwazi, nicknamedjihadijohn. today, your military air force is attacking us daily in iraq. he was eventually killed by a drone strike in 2015. aine davis is injail in turkey, convicted on terrorism offences.