Security in Washington tight

WASHINGTON - A small army of security forces, shuttered Metro stops, re-routed buses - Washington will leave nothing to chance this week to protect leaders at the Nuclear Security Summit.

The summit, to be attended by more than 40 nations - the widest international gathering the US capital has seen in decades - will draw on security know-how and manpower on a staggering scale and place parts of the capital under lockdown, officials said.

"The level of security needed ... is immense," said Washington Mayor Adrian Fenty, noting that the city is no stranger to "big events" like presidential funerals or visits by the Pope or Britain's Queen Elizabeth.