At least 600 people from the UK have travelled to support or fight for jihadist organisations in Syria and Iraq, according to British officials. Most of them are thought to have joined the group that calls itself Islamic State.
For three months, a BBC News team has been investigating the stories of these people. This database details what we know about those who have died, been convicted of offences relating to the conflict or are still in the region. The information on these pages has been compiled from open sources and BBC research. In some cases, the BBC has not been able to confirm specific details relating to the identity of an individual. Some details have been withheld for legal reasons.
Hundreds of young people from Britain are thought to be in Syria. Men have gone to fight alongside jihadist groups, and women have gone in support roles. Many of them have a presence on social media – or have allowed themselves to be talked about by others. It is not always clear what they are doing and where they are at any given time.
Security chiefs in the UK think 50 people from Britain have died as fighters in the conflict – and not all of these names are in the public domain. The individuals listed below are those the BBC has been able to identify by a number of open-source methods. In some cases, it has been impossible to verify to a satisfactory threshold the true identity of the individual.
More than a dozen people have been convicted so far of offences relating to the conflict. Some of the individuals listed below travelled to the region. Others tried to travel but were stopped. Finally, there is a group of people who have been convicted of offences relating to assisting the first two categories.