A school bus carrying students home from Hockinson Heights Elementary School was rear-ended as part of a four-vehicle crash at 2:33 p.m. Friday.Colleen Anders, director of teaching and learning with the Hockinson School District, said one student suffered minor injuries. A parent picked up that student after officials recommended an evaluation by a doctor. The rest of the students were transported home on a second bus.The bus involved in the crash was Bus 200, according to a release from the district, and Bus 209 ran late to help transport the students.Four people in other vehicles also were injured, according to Sean Smith, battalion chief with Fire District 3. Two were transported to PeaceHealth Southwest Medical Center, Smith said. Their names were not available.The crash occurred in the 18900 block of Northeast 164th Street in Brush Prairie. Smith said the street was blocked for close to an hour, delaying some other buses and drivers in the area.