He may have needed to visit the city to secure materials in any case.

The administration's most recent success in securing nuclear material underscores the need to move quickly and how far we have to go.

About the ruins the others were cutting down trees and securing material for a fire.

And yet our responsibilities in securing nuclear materials are being ignored.

But we cannot secure nuclear material faster simply by appropriating more money.

Other segments, restored briefly, had to be closed again in order to secure materials.

"Alutiiq had no experience in the field, and we did not want to experiment when it comes to securing nuclear material."

Evidently, there will be great overlap and competition to secure already scarce material.

Mr. Obama said he would lead an effort to secure nuclear stockpiles and materials across the world within four years.

But never before have they allowed mutual monitoring of storage sites, helping to secure nuclear material against theft.