UPDATE: According to Metropolitan Police, the children have been found.
A pair of teenage siblings have been reported missing.
The children, 16 and 14, were discovered missing from their beds on the morning of Monday, August 17, at their home in Hayes.
Both are described as being of Asian descent and are believed to have left in a family member’s white Toyota Prius in the early hours of that morning.
Detective sergeant Gary Walker, who is leading the investigation, said: "We are increasingly concerned for their welfare due to their ages, the length of time they have been missing, and the belief that they may be driving a car without a license.
"It is now a critical time in our investigation.
"By now the children, who are extremely vulnerable, could be anywhere in the country, so we are appealing to public to come forward with any information or sightings.
"We are particularly keen to here from anyone who may have offered them assistance or accommodation in recent days.
"Any piece of information, no matter how small, could be crucial to our investigation."
Police received a report of the missing children at 9.28am on August 17.
An ANPR camera recorded the missing vehicle later that morning at 11.24am on the A40 Oxford Road in Gerrards Cross, heading west towards Beaconsfield.
Since then, there have been no further camera reports of the car.
Anyone who sees the children is urged to call 999 immediately, quoting reference CAD 2117/17AUG.
Information can also be given anonymously via Crimestoppers by calling 0800 555 111.
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