Two of America's most visible civil rights activists are urging peace from people following the George Zimmerman trial, regardless of the verdict.

The Rev. Jesse Jackson is tweeting that message to his 20,000 Twitter followers as jurors deliberate Saturday for a second day in the racially charged case.

Former neighborhood watch leader Zimmerman is charged with second-degree murder in last year's slaying of Trayvon Martin.

Police in Florida say they're preparing for the possibility of mass protests or even civil unrest. Jackson says people should "avoid violence because it only leads to more tragedies."

Jackson also says that should Zimmerman be found guilty people should avoid "inappropriate celebrations because a young man lost his life."

The Rev. Al Sharpton is also urging peace after the verdict in the Florida murder trial against George Zimmerman, saying any violence would mar Trayvon Martin's name.

Martin was black and Zimmerman identifies himself as Hispanic; some activists argued that the initial delay in charging Zimmerman was influenced by Martin's race.

Sharpton organized the first rally calling for prosecution. He says that he and Martin's family have remained peaceful throughout the case.