Two men serving sentences for murdering two New York City police officers in 1971 were rearrested yesterday in connection with the killing of a San Francisco officer that same year, in what officials described as a series of attacks on police by the Black Liberation Army.

Along with five others, Herman Bell and Anthony Bottom were implicated in the murder of Sergeant John Young of the San Francisco Police Department, officials said. Young was killed on August 29, 1971, when officials said members of the radical group shot him through the bulletproof glass window of a police station in Ingleside, Calif.

Officials also arrested five individuals they described as former members of the Black Liberation Army in connection with the murder, including Francisco Torres, 58, of Queens. Also arrested in connected with the murder were Ray Michael Boudreaux, 64, of Altadena, Calif., Richard Brown, 65, of San Francisco, Henry Watson Jones, 71, of Altadena, and Harold Taylor, 58, of Panama City, Fla. Police arrested Richard O’Neal, 57, of San Francisco, on charges of conspiracy, but did not link him to Young’s death.

Officials said Young’s death was the result of one of a series of attacks on police between 1968 and 1973, including the 1971 murder of two New York City police officers, Waverly Jones and Joseph Piagentini. Jones and Piagentini were shot from behind in Harlem on May 21, 1971. Bell and Bottom, the latter of whom is known as Jalil Muntaqim, as well as another accomplice, Albert Washington, were later convicted of murdering them. Although nearly 36 years have passed since the attacks, officials in 1999 reopened investigations into several murders of San Francisco police officers in the 1960s and 1970s after “advances in forensic science led to the discovery of new evidence in one of the unsolved cases,” officials at the San Francisco Police Department said yesterday in a news release.

Although officials declined to elaborate on the forensic evidence in this case, Mr. Torres in July was forced to provide a court-ordered DNA sample to the authorities, the Daily News reported. He and his brother, Gabriel Torres, were suspected of planning the attack on Jones and Piagentini, but a judge ruled that there was insufficient evidence.

However, officials have now implicated Bell and Mr. Torres in Young’s murder. They said the two allegedly entered the Ingleside police station while several accomplices acted as lookouts and getaway drivers. Bell allegedly fired a shotgun through bulletproof glass, killing Young. Torres tried to set off dynamite as they fled, although the device failed.

Police also said Bottom and Washington were supposed to have joined them, but were arrested after a traffic stop that night when they fired on — but did not injure — a San Francisco police sergeant. When police searched their car, they discovered the .45-caliber gun used to kill the two New York City officers.

As he left police headquarters in Lower Manhattan yesterday, Mr. Torres, handcuffed and restrained by chains around his ankles, looked directly into news cameras that awaited his arrival. Asked if he killed Young, he said, “It’s a frameup.”

In a statement, Commissioner Raymond Kelly praised the arrests and reiterated his opposition to parole for Bell and Bottom. “They shot two New York City police officers in the back as part of a series of assassinations directed against police officers in those murderous days,” he said. “It may have been 35 years ago, but I certainly haven’t forgotten. Neither has anyone who was a member of the police department back then.”

Reached by telephone at her home on Long Island, Piagentini’s widow praised the arrests. “It’s good to know that the justice system has been, for 36 years, tracking this case,” Diane Piagentini said. “These are cold-blooded killers. They knew what they were doing back in ’71 and their purpose in ’71 was to kill police officers in this country.”

A spokesman for the Patrolmen’s Benevolent Association declined to comment.

Meanwhile, those involved in a movement to free Bell and Bottom reiterated their position yesterday that the men are political prisoners who should be released from prison.

“I know Herman Bell and Anthony Bottom and their case. They have said they are innocent,” City Council Member Charles Barron said.

Many members of the Black Panther Party were framed during the 1960s, Mr. Barron said, adding: “I think that was a time when there was a war going on when black people were killed with impunity by police officers.”

A lawyer representing Bell, Stuart Hanlon, called into question new evidence supposedly brought by police. “The evidence has been with the police for 35 years,” he said, adding that he believes police are targeting the wrong people for the murder. “They are trying to raise politics to arrest people,” he said.