It was one of the most brazen art thefts in history. Two thieves, posing as police officers, got past a night watchman at Boston's Isabella Stewart Gardner Museum. After tying him up, and a leisurely 81 minutes, they walked out with 13 works of art and into the annals of one of the world's most infamous unsolved crimes, says the New York Times. Yesterday, 23 years to the day after the theft, federal officials announced that they knew the identities of the thieves and said they belonged to a criminal organization based in New England and the Mid-Atlantic States. Officials believed they had traced the paintings to Connecticut and to the Philadelphia area a decade ago, but those trails had since grown cold. U.S. Attorney Carmen Ortiz said, “I think we're all optimistic that one day soon the paintings would be returned to their rightful place.” The FBI is starting a publicity campaign to focus attention on the paintings in the hopes of getting leads from the public and possibly from acquaintances of the thieves, anyone who may have glimpsed one of the paintings.