A bicyclist was seriously injured in a collision with a school bus in Darnestown, Md., on Wednesday afternoon, according to Montgomery County Fire & Rescue. The collision took place at the intersection of Darnestown and Berryville Roads. Darnestown Road is shut down in both directions between 118 and Berryville Road. The bicyclist sustained life-threatening injuries and was taken to an area trauma center. No injuries on the bus were reported.