
[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/03/18/vermeer.concert.art.jpg caption=""The Concert" is one of only 35 known works by Dutch master Johannes Vermeer."]
By Alina Cho, CNN
(CNN) – It is the largest art heist in history.
For 20 years, investigators have been chasing down hundreds of leads. They've interviewed countless witnesses all over the world, and still the central questions remain: where is the art and who did it?
What happened on March 18th, 1990 at Boston's Isabella Stewart Gardner Museum? A a new portrait is now emerging about the famous heist, with some tantalizing details.
Investigators say at precisely 1:24 a.m., two men disguised as policemen knocked on the side door of the museum, saying they were called to look into a disturbance. The night watchman let them in.
Once inside, the thieves handcuffed both of the guards on duty, tied them up with duct tape and then, with free reign of the museum, they went to work.
What the pair took, didn't take, and how they did it, is as baffling to investigators as the crime itself.
"Certainly, they don't know a lot about art," says Geoffrey Kelly, special agent, FBI, Boston Division.
(CNN) – Republican Sen. Lindsey Graham is offering the White House a deal: His party's support on closing Guantanamo Bay for a deal to try self-professed 9/11 mastermind Khalid Sheik Mohammed and four others in military tribunals.
The deal would reverse a plan by the Obama administration to try the suspected terrorists in a civilian court. There is steadfast support on both sides and time for debate is running out. Our Susan Candiotti has the report.
Read more: White House considers military trial for Khalid Sheikh Mohammed
(CNN) – A new political ad is asking Attorney General Eric Holder to name DOJ staffers who have represented terror detainees in the past.
Some lawmakers on Capitol Hill say that's a fair question. But on the other side, legal experts and politicos, both Republicans and Democrats, are calling it a witch hunt. Our Jeanne Meserve has the AM Original report.
(CNN) – 911 calls can show us how lives were saved, and sometimes how they could have been saved. Now, several states are considering laws that would keep the public from hearing the recordings.
Does a caller's right to privacy trump your right to hear it?
Susan Howley, spokesperson for the National Center for Victims of Crime, supports banning the release of the calls. David Cuillier, chairman of the Society of Professional Journalists' Freedom of Information Committee, says releasing emergency calls can do a public service. They debated the issue with us on Monday's American Morning.
(CNN) – Chicago is the front line for a historic gun battle that's now being waged before the Supreme Court.
On one side, those who say their Second Amendment rights to keep and bear arms have been violated. On the other, parents and teachers who swear their city's handgun ban is saving lives on some very rough streets. Our Kate Bolduan has the report from Chicago's south side.

