Minneapolis, MN — Police say they have not been able to locate Mary Grace Westman, the mother of 23-year-old Robin Westman, who opened fire at Annunciation Catholic Church and School earlier this week, killing two children and injuring at least 18 others.

Robin, a former student of the school, left behind a disturbing manifesto detailing years of inner conflict. In it, he expressed rage over his transgender identity, resentment toward his past, and admiration for other notorious mass shooters. Authorities believe these writings may hold key clues into the motive behind the tragedy.

Investigators say Mary Grace once worked at the same Catholic parish where the shooting took place, but her current whereabouts remain unknown. Detectives have not confirmed whether she is evading authorities or in potential danger herself. The FBI and local police are now working together to track her down.