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Return of the jihadis: The law in Britain and how only one in ten returning jihadis have been prosecuted
Britain has only prosecuted 40 citizens in five years who fled to join ISIS and then came back.
In 2018 security Minister Ben Wallace told MPs 400 Britons who travelled to join ISIS returned home - but only one in ten were put in the dock.
Around 850 Britons are believed to have travelled to Iraq and Syria, with around one in six believed to be dead.
The Home Office says every person who returns is questioned by police and an assessment made over whether they are a threat to Britain.
However few have been prosecuted.
The Counter-Terrorism and Border Security Bill is currently going through Parliament, after its third reading in the House of Lords.
It could make travelling abroad to join terror groups an offence which carries a penalty of ten years in prison.
The bill has now returned to the House of Commons for consideration of Lords amendments.
The lawyer for Shamima Begum's family has asked authorities to treat the girl, and any surviving friends, as victims.
It is not yet known if Amira Abase and Sharmeema Begum lived.