The decision came following a discussion among area law enforcement leaders, according to the two agencies.
Sheriff Bill Gore called the allegations, publicly aired for the first time last week by three of the mayor's former supporters, "extremely sensitive matters." He said the agency will not release details of ongoing investigations, and the alleged victims will be provided anonymity.
A hotline has been set up at (619) 481-0220. The Sheriff's Department said the number should only be used by those willing to come forward with information.
Any cases that arise will be handled by Capt. Duncan Fraser of the sheriff's Central Investigations unit.