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NASA's investigation into the Columbia disaster is wide open, the agency saying there's insufficient evidence that damaged heat tiles caused the crash. Meanwhile, another memorial service is held for the crew, and future manned science missions come under scrutiny as critics argue that most of the work doesn't need humans at all. Hear from NPR's Richard Harris and NPR's Joe Palca.

The Bush administration raises the national terrorism alert status from yellow to orange, signaling a "high risk" of terrorist attack. A government official says Friday's move is based on an increase in information that suggests an attack may occur as Muslims mark the haj, a five-day ritual that begins Sunday.

Members of the U.N. Security Council consider U.S. Secretary of State Colin Powell's report detailing evidence against Iraq. In Brussels, Belgium, NATO ambassadors will meet to discuss the U.S. case for military action against Iraq. Hear NPR's Vicky O'Hara and Guy Raz.

NASA investigators are continuing to comb through telemetry data and internal records, examine debris and evaluate other sources of information includic home videos and eyewitess accounts. Meanwhile the remains of the astronauts arrive at Dover Air Force Base. NPR's Richard Harris reports.

The remains of Columbia astronauts are flown to Dover Air Force Base in Delaware, while investigators continue to recover and study shuttle fragments. Meanwhile, two in Texas are charged with theft of government property for looting shuttle debris. Hear NPR's Richard Harris and NPR's Larry Abramson.

He is also known as "?uestlove" of the hip-hop group The Roots. The Grammy award-winning sextet has six albums to its credit. Their latest CD is Phrenology. Their first single from the album is "Break You Off." One reviewer writes, "To fully savor the sound, you've got to commit to spending time with The Roots, to wallow in both the music and the message. There's Chuck Berry-style rock-and-roll, jazz fusion, funk, poetry, shoutouts to hip-hop pioneers, lyrical slaps upside the heads of money-mad rappers, black nationalism and some groove-laden neo-soul musings."

U.S. Secretary of State Antony Blinken is attending the meeting in Brussels. The U.S. and Europe are imposing new sanctions on Russia and promising to speed up deliveries of weapons to Ukraine.

Robert talks with Jim Hall, former chairman of the National Transportation Safety Board, about NASA's decision to use the NTSB model to figure out why the Columbia broke up on re-entry into the Earth's atmosphere.

As NASA officials study data and debris from space shuttle Columbia, the initial focus is on an accident at liftoff that may have caused a chain of problems that led to catastrophe. But experts say little could have been done to rescue the ship, even if launch problems had been considered a threat to the mission. NPR's Larry Abramson reports.

Secretary of State Colin Powell delivers detailed evidence against Saddam Hussein to the U.N. Security Council. He lists ways the U.S. says Iraq is continuing to violate U.N. resolutions against weapons development -- and details charges that Iraq has aided terrorists. NPR's Robert Siegel talks with analysts Jessica Tuchman Mathews, president of the Carnegie Endowment and with Judith Yaphe, Senior Fellow at the National Defense University.