(CBS DETROIT) - Thursday marks two years since the deadly mass shooting at Oxford High School .

Oxford Community Schools is holding at moment of silence Thursday at 12:51 p.m., the time of the shooting two years ago, and is urging people in Michigan to light a candle or luminary in remembrance at 7 p.

Ethan Crumbley walked into his school and killed four students—Madisyn Baldwin, Tate Myre, Hana St. Juliana and Justin Shilling—and injured seven others.

Oxford parents attended a roundtable discussion where topics included gun safety, mental health, and more the night before the two-year anniversary of the deadly school shooting.