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 husband of the second missing Bradford woman, believed to have fled to Syria, has said he is not angry and begged for her to come home.
Khadija Dawood, 30, has left with her son and daughter but today her husband Mohammed Shoaib told a press conference they were in a "perfect relationship".
He added: "I'm not angry. Everything is normal. Please come home."
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.