SAN FRANCISCO (AP) - Prosecutors have dismissed murder charges against four alleged ex-members of the Black Liberation Army accused of killing a San Francisco police officer in 1971.

The charges were dismissed Monday against Henry Jones, Ray Boudreaux, Richard Brown and Harold Taylor in the killing of Sgt. John V. Young during an attack on a police station.

Another defendant, Anthony Bottom, pleaded no contest Monday to conspiracy to commit voluntary manslaughter in Young's death as part of a deal with prosecutors.

Bottom and Herman Bell were convicted of murdering two New York City police officers and are currently serving prison sentences.

Francisco Torres of New York is the other defendant.

Bell's attorney Stuart Hanlon says defense attorneys will argue their clients cannot get a fair trial because too much time has passed.