More than 10 months after a bullet pierced a window of Supreme Court Justice Harry A. Blackmun's apartment in Rosslyn, the FBI said it has concluded that it was "unlikely" that the shot was aimed at Blackmun or his wife Dorothy.

"We found no evidence of a deliberate attempt on the life or well-being of Justice and Mrs. Blackmun," FBI spokesman Lane Bonner said of the Feb. 28 incident.

Blackmun, who has been a target of death threats since writing the court's controversial 1973 decision legalizing abortion, had just left the living room of the couple's third-floor apartment when the shot was fired shortly after 10 p.m. His wife was showered with glass when the 9 mm bullet hit the window, but she was unharmed.

The FBI initially suspected that antiabortion groups may have been responsible for the shooting, but it backed off that theory when preliminary ballistics tests indicated that the bullet was fired from a great distance.

"An examination conducted by the FBI laboratory determined that the shot was fired by a handgun, and, based on the trajectory and velocity, was probably fired from a location across the Potomac River under circumstances that greatly exceeded the accuracy of a handgun," according to an FBI statement released last week.