US officials worried about security at London 2012 Olympics

The US has raised repeated concerns about security at the London Olympics and is preparing to send up to 1,000 of its agents, including 500 from the FBI, to provide protection for America's contestants and diplomats, the Guardian has learned.

American officials have expressed deep unease that the UK has had to restrict the scope of anti-terrorism "stop and search" powers, and have sought a breakdown of the number of British police and other security personnel that will be available next summer.   More Read