The FBI is again seeking the public's help in solving the $500 million Isabella Stewart Gardner Museum heist, this time releasing surveillance video showing a man going into the museum, using the same entrance the thieves, 24 hours before the heist.

The low-resolution security-camera video shows a security guard allowing a man to enter the Mission Hill museum's rear entrance — against museum policy — at 12:49 a.m. on March 17, 1990, the day before the infamous theft. About 24 hours later, the thieves would use the same entrance.

The video also shows a car pull up to the museum's rear entrance that fits the description of a car parked outside the museum before the heist, the FBI said.

The FBI said it hoped releasing the video would help identify either the man or the car, and asked people with information to call the FBI at 617-742-5533 or the Isabella Gardner Museum at 617-278-5114.

“Over many months we have engaged in an exhaustive re-examination of the original evidence in this case. Our aim has been to ensure that all avenues have been explored in the continuing quest to recover these artworks,” said United States Attorney Carmen Ortiz, in a statement. “Today we are releasing video images from the night before the theft — images which have not previously been seen by the public — with the hope of identifying an unauthorized visitor to the museum. With the public’s help, we may be able to develop new information that could lead to the recovery of these invaluable works of art.”

Watch the video: