An independent review will examine safety policies and performance under the Boston Public School's transportation contract with Transdev, which manages 750 school bus drivers in the city.

Boston will turn to a former federal prosecutor to conduct an independent investigation of its public schools transportation contractor, more than three weeks after a 5-year-old was killed in a school bus crash.

The decision to initiate an independent review follows the tragic death of Lens Arthur Joseph, a 5-year-old kindergarten student, city officials say.