ISIS' murderous regime.

Here we profile some of the more notorious Britons who went to Syria after the caliphate sprang up in 2014 - and their fates:

DEAD

Mohammed Emwazi/Jihadi John

DEAD: Mohammed Emwazi (picture above) , brandishes a knife in this still file image from a 2014 video

A barbaric killer who horrified the world when he starred in videos beheading orange-clad British and American hostages. Nicknamed ‘Jihadi John’, Emwazi was the most notorious member of the British IS gang known as the ‘Beatles’ who murdered 27 people. Kuwaiti-born Emwazi, 27, who grew up in west London, was finally obliterated in a US drone strike in November 2015.

Reyaad Khan

DEAD: Reyaad Khan (pictured above), a British citizen who died fighting for Islamic State

The former student from Cardiff appeared in a chilling IS propagandavideo smiling, clutching an AK-47 assault rifle and urging terror attacks on the UK. David Cameron ordered an RAF drone strike that killed Khan, 21, and fellow jihadi Ruhul Amin, 26, from Aberdeen, in August 2015. Mr Cameron told the Commons: ‘My first duty as prime minister is to keep the British people safe.’

Sally Jones

DEAD: 'White Widow' Sally Jones (pictured above) was killed by a drone, according to the CIA

Travelled to Syria in 2013, aged 44, with her son Jojo, nine, who was forced to participate in IS propaganda videos. She recruited jihadis by boasting: ‘You Christians all need beheading with a nice blunt knife... Come here, I’ll do it for you.’ She and her son are believed to have been killed in a 2017 drone strike. Jones,