FBI Special Agent in Charge Richard DesLauriers (right) stands next to a poster that shows a Rembrandt painting and a reward during a news conference at FBI headquarters in Boston on Monday, March 18, 2013. The FBI believes it knows the identities of the thieves who stole artworks valued at up to $500 million from Boston's Isabella Stewart Gardner Museum more than two decades ago. Mr. DesLauriers says the thieves belong to a criminal organization based in New England and the Mid-Atlantic states. (AP Photo/Steven Senne)

Photo by: Steven Senne

FBI Special Agent in Charge Richard DesLauriers (right) stands next to a poster that shows a Rembrandt painting and a reward during a news conference at FBI headquarters in Boston on Monday, March 18, 2013. The FBI believes it knows the identities of the thieves who stole artworks valued at up to $500 million from Boston's Isabella Stewart Gardner Museum more than two decades ago. Mr. DesLauriers says the thieves belong to a criminal organization based in New England and the Mid-Atlantic states. (AP Photo/Steven Senne)