Tia Sharp hunt: Police seal off grandmother's home
10 August 2012 Last updated at 14:20 BST
Police investigating the disappearance of missing schoolgirl Tia Sharp have sealed off an area around her grandmother's home in south London.
Tia, 12, vanished after leaving the home in New Addington, Croydon, to go shopping exactly a week ago.
About 20 uniformed officers arrived at Christine Sharp's house at lunchtime and cordoned off an alleyway as part of a pre-planned forensic search.
The BBC's Ben Ando reports on the latest developments from outside the house.