Five questions about the Michigan shooting addressed by school officials.

On Saturday, the Michigan school district of Oxford High School, Oxford Community Schools, announced in a letter to parents and staff members that it would seek an outside party to investigate Tuesday’s shootings that left four students dead and many wounded. The shooting suspect, Ethan Crumbley, 15, has been charged with murder and terrorism, and his parents, James and Jennifer Crumbley, have been charged with involuntary manslaughter. Each of them has pleaded not guilty.