from The Great Debate:

Danger and delay on dirty bombs

By Kenneth N. Luongo
December 16, 2013

When highly radioactive material that can be used in a “dirty bomb” is moved to or from a hospital in New York City, it is done in the dead of night on cordoned streets with high security.

from Tales from the Trail:

How to ease traffic tie-ups in Washington: hold a nuclear security summit

April 12, 2010

There's nuclear security, and then there's street security. NUCLEAR-SUMMIT/OBAMA

High-level delegations from nearly 50 countries gathered in Washington to talk, talk, talk, and talk some more about keeping the world safe from nuclear terrorism at the Nuclear Security Summit hosted by President Barack Obama.