City officials say most of the $12 million cost of playing host to the event involves security.

The broadcast was quickly and often switched off for secret testimony deemed to involve national security.

"I can't confirm or deny matters involving security," he said.

Your name came up in conjunction with a case involving national security.

It is most often used for classified briefings involving national security.

The thorniest issues are before them, involving security, borders, water rights and political relations.

All I can tell you is it involves bomb components and national security.

Since then, the Senate has conducted 45 secret sessions, most of them involving national security.

At one point, he interviewed a senior official for a new position in the department involving national security.

The police would be allowed to search and seize evidence without a warrant in cases they deemed to involve national security.