Police sniffer dogs train for 2012 Olympic security duties
As London prepares to host the Olympic games in 2012, extra police sniffer dogs are being recruited to increase security.
Eight dogs and their handlers have begun a 10-week course at the Metropolitan Police dog training centre in Kent, learning to detect explosives.
The dogs will then gain on-the-street experience before being deployed at airports, hotels and venues in 2012.
Danny Shaw reports.