We will continue to pursue additional protective measures for as long as it takes to ensure the safety and security of our citizens.

WHITEHOUSE: President Obama��s Statement on Security Alert

In the briefing Chairman Jaczko updated the President on the status of the reactors at the plant in Japan and on additional protective measures the United States is taking to ensure the safety of American citizens in that region of Japan.

WHITEHOUSE: Press Briefing

Secretary MICHAEL CHERTOFF (Department of Homeland Security): We have asked state and local leaders and transportation officials to increase their protective measures including additional law enforcement, police, bomb-detecting canine teams, increased video surveillance and increased numbers of inspection of trash receptacles and other storage areas.

NPR: New York, Los Angeles Step Up Security