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Also: Yemen's Saleh hands over power to hand-picked successor; WikiLeaks starts releasing security firm Stratfor's emails; gunfire breaks out at an Ohio high school.

At least one student has died, authorities say, and four others were injured. A suspect is in custody.

Ahead of Tuesday's primary, Romney and Santorum appeared tied in Michigan but polls indicated the former Massachusetts governor was significantly ahead in Arizona. Other polls showed the health-care law to be unpopular in some battleground states and gave mixed signals about whether or how much Obama's re-election chances had improved.

Russian and Ukrainian security services claim to have foiled the plan. The suspected mastermind, Chechen warlord Doku Umarov, remains at large.

The company also said it would resubmit an application to the Obama administration that reroutes the pipeline away from the environmentally sensitive Sandhills of Nebraska.

Giving kids a Wii and active video games isn't enough to increase their daily exercise, a new study found. The active gamers didn't move more than children playing traditional sit-on-the-sofa video games.

International leaders met last week to address the piracy, famine and terrorism in Somalia. Many previous attempts by the international community to intervene have failed. Jeffrey Gettleman, East Africa Bureau Chief for The New York Times, discusses the world's options.

Hear the L.A. band blend Americana and electronic music on its debut EP, Tell the Right Story.

The rebel group has kidnapped thousands during Colombia's bloody and decades old conflict with the leftist guerilla.

For the first time, the Pritzker Prize has been awarded to an architect based in China. Wang Shu, 49, is interested in preservation, working slowly and tradition — ideals that are often at odds with today's booming China.