FILE - In this Dec. 9, 2013, file photo, a school resource officer in Anderson, Calif., walks a middle school student back to class.
Portland Public Schools, Oregon's largest school district, will discontinue its use of Portland Police Bureau school resource officers.
The district of more than 49,000 students joins Minneapolis, which severed ties with its school resource officers on Tuesday.
Protesters in Charlottesville, Virginia, have made the end of the school resource officer program in their district one of their demands.
There are an estimated 25,000 school resource officers nationwide, said Mo Canady, executive director of the National Association of School Resource Officers, whose association represents about 10,000 dues-paying officers.