A mother and her four young children who are feared to be travelling to Syria are being sought by police.
The family, from London, was last seen on Tuesday morning and they were thought to have left the country later that day.
Zahera Tariq, 33, and her children, aged four to 12, are believed to have travelled from London City Airport on a flight to Amsterdam in the Netherlands.
A family member contacted Scotland Yard to report them missing on Wednesday.
It is now feared Ms Tariq may be considering travelling to war-torn Syria with her three sons Muhammad, Amaar and Aadid and daughter Safiyyah.
There have been several previous cases in which women and children from the UK are believed to have gone to parts of Syria controlled by Islamic State.
Police have released two CCTV images of the Waltham Forest family at London City Airport in a bid to track them down.
Commander Richard Walton, from the Metropolitan Police Service's Counter Terrorism Command, said: "We're concerned about Zahera and her four children and we're doing all we can to work with our partners and colleagues both here and abroad to try and locate them and make sure they are all safe and well.
"Whilst we do have some concerns that Zahera may be thinking of travelling to Syria, there is no current information to suggest that she's already travelled there.
"Her family are extremely worried about her and her three sons and daughter and we would urge anybody with information to contact us as soon as possible."
Officers are working with authorities in the Netherlands as parts of efforts to find the family.
Ms Tariq is described as an Asian woman of medium build, approximately 5ft 3ins tall, with long black hair.
Her oldest son, Muhammad, is 12 years old and is of medium build, approximately 5ft tall and has medium-length black hair.
Amaar, aged 11, has a skinny build and medium-length black hair. Safiyyah, who is nine, is of skinny build and has long black hair. The youngest son, four year old Aadid, has black hair.
In July it was reported that several members of the same family from Luton, including three children, were feared to have travelled to Syria after a holiday in Bangladesh.
Scotland Yard recently confirmed that it believed more than 40 women and girls had travelled to Syria from Britain in the past year.
