What we know about the British hostage held by IS
The British aid worker being held by Islamic State is David Haines.
This is what we know about Haines:
The 44-year-old was taken hostage in March 2013 at the Atmeh Refugee camp near the Turkish border
Haines was working for a non-governmental organisation at the time
He was the subject of a failed rescue bid
Haines was born in Yorkshire and grew up in Perth, Scotland
He is married to a Croatian woman with whom he has a young daughter
The hostage has a 17-year-old daughter from his first marriage
He has worked for aid agencies in South Sudan, Libya, and Syria