British Police have begun testing Olympic 2012 venues against all potential terrorist threats.

The London Games take place next summer and will be the UK's largest security operation during peacetime.

They will be policed at a 'severe threat' level which is the second-highest status.

UK government has reportedly allocated £600 million for the security operation.

There will be a total of 34 Olympic venues and fans will face airport-style security before being allowed access into venues.