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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.

President Obama said the FBI is investigating Monday's twin bombings at the Boston Marathon "as an act of terrorism." Meanwhile, law enforcement officials are asking the public to submit photos and videos from the scene. And Boston Mayor Tom Menino said that as the city grieves the victims it is also proud of those who helped in the explosions' aftermath.

With D.C. real estate booming, it's no surprise that the government is thinking about unloading a building seen by many as an eyesore. The J. Edgar Hoover Building, headquarters of the FBI, sits on a valuable spot along Pennsylvania Avenue, not far from the Capitol and the White House.

Robert Mueller has been the U.S. government's indispensable man when it comes to national security. When his 10-year term as FBI director expired, the Obama administration asked Congress for an unprecedented two-year extension. But now, the clock is ticking on finding his successor.

The federal criminal complaint against New York politicians as the result of an FBI sting was a reminder of how often real-life political scandals can read like the imaginings of Hollywood screenwriters.

In 1990, men dressed as police officers made off with 13 art pieces valued at up to $500 million. They included two Rembrandt oil paintings. The FBI is asking for help in locating them.

The ruling deals a blow to the Obama administration's surveillance practices. This ruling affects demands popularly known as "national security letters" that allowed the FBI access to phone, financial and electronic records without court approval and in secret.

A Portland, Ore., resident was arrested Tuesday on charges of conspiracy to provide material support to terrorists. The FBI says Reaz Qadir Khan, 48, gave money and advice to a man involved in a deadly 2009 suicide bomb attack on the headquarters of Pakistan's intelligence service in Lahore.

The Scooter Store says it's fully cooperating. Investigators wanted to see its billing records. Questions have been raised about the money Medicare has to spend on power chairs. Meanwhile, at airports there's a growing problem: travelers who abuse wheelchair rules to get around long lines.

Authorities say Nouel Alba of the Bronx pretended to be a relative of a 6-year-old victim and collected donations for a "funeral fund." When confronted about it, they allege, she lied to FBI agents. So far, she's only been charged with lying to authorities. Other charges could follow.