Detectives trying to trace missing schoolgirl Alice Gross have moved their search to a National Trust-owned estate near to where she was last seen more than a month ago.

Scotland Yard officers are combing Osterley Park, in west London, for the first time, which is around two miles from the location of the 14-year-old's last sighting near the Grand Union Canal.

It has been exactly a month since Alice failed to return home to her family, sparking the Metropolitan Police's biggest search operation since the 7/7 bombings.

The National Trust describes Osterley Park as a Georgian country house and estate in London.

More than 300 officers from over a dozen police forces across the country are involved in the increasingly desperate hunt, which has even called on the assistance of the RAF who helped to identify possible new search sites.

And a stretch of the Grand Union Canal, which Alice walked alongside before she disappeared, was sifted through in the hope to recover her possessions, including her iPhone, but officers again drew a blank.