Al Sharpton, Jesse Jackson en route to Sanford, Fla., for Trayvon Martin rally

According to WESH.com, Jesse Jackson also will be there:

Rev. Al Sharpton and Rev. Jesse Jackson will be back in Sanford on Saturday.

The well-known civil rights activists will lead a rally and march that begins at Crooms Academy and ends at the Sanford Police Department.

The Orlando Sentinel reports that Sharpton is threatening to escalate civil disobedience:

If George Zimmerman is not arrested in the shooting death of Trayvon Martin soon, theRev. Al Sharpton will call for an escalation in peaceful civil disobedience and economic sanctions.