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The government puts the nation on heightened alert for the possibility of terrorism. The Bush administration raises the alert one notch to code orange, signaling a "high risk" of attack, based on communications chatter possibly linked to al Qaeda terrorists. NPR's Don Gonyea reports.

Space shuttle Columbia's nose cone is found in the eastern Texas woods. Recovery teams hunting for debris from the Feb. 1 disaster spread out further Tuesday, searching as far west as Arizona. NPR's Eric Niiler reports.

Secretary of State Colin Powell provides detailed evidence against Saddam Hussein to the U.N. Security Council and lists ways America says Iraq is continuing to develop weapons and help terrorists. Iraq's U.N. ambassador responds. Hear reports from NPR's Vicky O'Hara and NPR's Michele Kelemen.

President Bush sends Congress a 2004 budget totaling $2.23 trillion, with the largest increases going to defense and homeland security. But some in Congress say the president should scale back some of the proposed tax cuts and allow more social spending. NPR's David Welna reports.

Secretary of State Colin Powell prepares to share U.S. intelligence with the U.N. Security Council, in hopes of persuading members that Iraq is in defiance of U.N. weapons resolutions. Meanwhile, British Prime Minister Tony Blair urges European nations to support the U.S. position. NPR's Vicky O'Hara and NPR's Guy Raz report.

North Korea says it has reactivated its nuclear facilities at Yongbyon. The country says it needs the reactor to produce electricity, but U.S. officials fear the plant could be used for the production of nuclear weapons. NPR's Rob Gifford reports.

A panel of former NASA engineers and military officials prepares to take over the Columbia investigation. More than a week after the space shuttle broke apart upon re-entry, NASA says it has no clear answers. NPR's Jon Hamilton reports.

A panel of former NASA engineers and military officials prepares to take over the Columbia investigation. More than a week after the space shuttle broke apart upon re-entry, NASA says it has no clear answers. NPR's Eric Niiler reports.

At a security conference in Munich, Germany, Defense Secretary Donald Rumsfeld argues that the world must prepare for military action against Saddam Hussein. But he fails to convince France and Germany. Hear NPR's Tom Gjelten, Robert Kagan of the Carnegie Endowment for International Peace and Charles Kupchan of the Council on Foreign Relations.

NASA officials expand the search for debris from the space shuttle Columbia in an effort to learn more about what caused the vehicle to break apart upon re-entry Feb. 1. At a memorial service in Houston, President Bush pays tribute to the seven astronauts who died. Hear NPR's Joe Palca and NPR's Wade Goodwyn.