The Bradford sisters missing with their nine children were stopped from leaving the UK in March, ITV News has learned.
Their trip to Saudi Arabia was rebooked for May but there is no suggestion they were intending to travel to Syria at that time. Police are now trying to work out when the trip was planned.
The family of three British sisters from Bradford who are believed to have travelled to Syria with their nine children have condemned their actions.
Sugra, Zohra and Khadija Dawood were meant to return home on March 19 after a pilgrimage to Saudi Arabia.
Speaking from Pakistan, one of the husbands of the missing Bradford thought to be heading to Syria has told ITV News of his worry.
Here's what we know about the Bradford family of 12 who are feared to be travelling to Syria.