Around half an hour after the visit from the Queen, William, Kate and their baby were seen being driven away from Kensington Palace.
The Duchess was sitting in the back of the vehicle next to the baby seat while the Duke was a front-seat passenger.
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Officers found the women suffering from devastating injuries.
Around 60 firefighters are working on the blaze to stop it spreading to nearby premises.
Dre Wilson was last seen shortly after 9pm on Friday running along Harby Lane in the Vale of Belvoir in the Midlands.