A bomb squad destroyed another suspicious package at the Napa home of the parents of the former Bay Area transit officer arrested for shooting an unarmed man at a BART station.
The Napa police department said the package was found Saturday and did not contain explosives.
It was the second time that authorities went to the home belonging to Johannes Mehserle's parents. On Wednesday, a bomb squad destroyed two packages left on their porch.
Mehserle and his family have received death threats since the New Year's Day shooting of Oscar Grant. Mehserle has been charged with murder and has pleaded not guilty.
He resigned from BART after the shooting.
On Monday a rally and march was held in Oakland to protest the shooting. It was the third rally and was scheduled in connection with the Martin Luther King holiday.
About 200 protesters rallied peacefully at a West Oakland train station over Grant's death. There was a high police presence, but protesters stayed calm.
The demonstrators beat drums and carried signs that read "Stop police brutality in the black community" and "Justice for Oscar Grant." They marched from the West Oakland BART to DeFremery Park.
Organizers said the rally was meant to draw attention to police brutality and organize to stop it.