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Clues are still being sifted — most notably, perhaps, from video that shows a man setting down a bag and leaving the scene. No arrests have been made. Thursday morning, President Obama is at an interfaith service in Boston where the victims will be remembered.

Paul Kevin Curtis, the 45-year-old Mississippi man arrested Wednesday in connection with the possibly ricin-tainted envelopes sent to President Obama and at least one senator, has taken to Facebook in recent years to claim he knows of an organ-harvesting scheme. He's also an entertainer.

Pervez Musharraf, who was on trial on treason charges related to his 2007 order to arrest dozens of judges, is holed up at his residence on the outskirts of the capital, Islamabad.

Also: Suspect in ricin letters described as conspiracist and Elvis impersonator; North Korea "sets conditions" for return to talks; and former Rep. Gabrielle Giffords expresses her anger after gun bills fail in Senate.

Gun control advocates are regrouping after the Senate's failure to pass new gun regulations on Wednesday. Host Michel Martin talks about the political news of the week with analysts Maria Teresa Kumar, Lenny McAllister and NPR's senior Washington editor, Ron Elving.

Alcohol has bolstered many writing sessions throughout history — not just as a drink but as an ink. For most of the last millennia, writers, artists and kings alike relied on an ink that commonly included wine. Now some people are trying to bring this tradition back.

A push to make narcotic painkillers harder to abuse means that generic versions of OxyContin won't be allowed. But drugs that are more resistant to abuse are expensive and can still be addictive.

When volunteer firefighters in the city of West, Texas, about 20 miles north of Waco, arrived to battle a fire at a fertilizer plant, they encountered a disaster in the making. Steve Inskeep and David Greene have more details on the explosion that followed Wednesday night.

In a new documentary premiering on HBO, the journalist explores the life of his friend, the war photographer Tim Hetherington. The two collaborated on the 2010 documentary Restrepo, and Junger was profoundly changed after Hetherington was killed by shrapnel in Libya in 2011.

Investigators have said the key clue is likely to come from photos or video taken by the public, and social media sites are buzzing with theories about possible suspects. But with so many images out there, it's like trying to find the one slightly off-white pingpong ball buried under 10,000 white pingpong balls.