Lt. J. Paul Vance of the Connecticut State Police conducts a news briefing Saturday in Newtown, Conn. The strategy for dealing with the wave of news media in Newtown echoes that of some past tragedies, experts say. Jason DeCrow/AP hide caption

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Police gather at the east entrance of Columbine High School in Littleton, Colo., on April 20, 1999. School security has improved markedly since the Columbine shooting, experts say, but there still are problems. Mark Leffingwell/AFP/Getty Images hide caption

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This picture received from North Korea's official Korean Central News Agency on Wednesday shows an orbit image of the satellite Kwangmyongsong-3, being monitored on a large screen at a satellite control center in Cholsan county, North Pyongan province in North Korea. AFP/Getty Images hide caption

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This image from North Korea's official Korean Central News Agency shows the long-range rocket Unha-3 as seen at a satellite control center prior to Wednesday's successful launch. KCNA via KNS/AFP/Getty Images hide caption

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An empty container ship waited near the Port of Los Angeles during the eight-day strike by members of the International Longshore and Warehouse Union. The stoppage put a halt to most of the work at the Los Angeles and Long Beach ports. Kevork Djansezian/Getty Images hide caption

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Committe Chairman John Kerry , D-MA, speaks during the Senate Foreign Relations Committee hearing on the nomination of Robert Beecroft to be ambassador to Iraq Sept. 19 in the Dirksen Senate Office Building on Capitol Hill in Washington, DC. Mandel Ngan/AFP/Getty Images hide caption

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A map in China's new passports shows disputed islands and territorial waters as belonging to China, which has angered several of its neighbors. He Yuan/EPA/Landov hide caption

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President Obama (center) and U.S. Secretary of State Hillary Clinton (right) toured the Shwedagon Pagoda in Yangon, Myanmar, on Monday. Carolyn Kaster/AP hide caption

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The Capitol on Monday, as Congress prepared to return for its post-election lame duck session. Alex Brandon/AP hide caption

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Obama supporters react as President Barack Obama was declared the winner Tuesday, during the Nevada State Democratic Party gathering at the Mandalay Bay Resort and Casino in Las Vegas. John Gurzinski/AP hide caption

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