About a half-dozen school security officers will be placed in some Anacostia elementary schools Thursday in the wake of the Monday rape of a 12-year old girl at her Southeast elementary school, a D.C. school safety official said yesterday.

Shelton Lee, director of safety and security for the D.C. schools, said that the security officers will be placed in the schools at the insistence of D.C. schools Superintendent Floretta D. McKenzie. On Monday Lee had said no additional school security plans were being made.

Lee refused yesterday to say specifically what schools are marked for the increased security, for fear of undermining the operation.

He said the officers, whom he calls community aides, will, among other duties, be on the lookout for outsiders in school buildings. He said the aides will remain in place for at least 30 days.

"I am also placing an investigator in the school where the rape occurred to evaluate the situation," Lee said, adding that a more long-term alternative to ensure student safety is being sought.

Lee said the new measures were precipitated both by Monday's incident and a number of rapes of adult women in the Anacostia area.

Police said they are continuing their investigation of Monday's rape, but reported no new developments.

A spokesman for the school where the attack took place said a meeting of area parents is scheduled at the school tonight to determine how students can be better protected.