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 fathers of missing children who are feared to have been taken to Syria by their mothers are"distraught" and "confused", an MP has said.
Bradford West Labour MP Naz Shah told BBC Breakfast that she had spoken to two of the three fathers who told her that they had had no contact with the women or children.
"I asked them if there was any indication and they said absolutely not - it was a shock to them, it came out of the blue," Ms Shah said.
"The men are very, very distraught. They are confused and did not know what was happening or why it was happening.
"At this time there is no contact, absolutely zero contact with the women or children. The last contact was a few days ago when they were due to leave."
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.