Timeline details what led to arrest in alleged school shooting plot

Montgomery County police released a timeline of details into the investigation of a high school student who is charged with threats of mass violence. In a joint investigation with the FBI, Montgomery County police said they discovered a manifesto written by Andrea Ye, 18, of Rockville, whose preferred name is Alex Ye. Authorities said the writing was about committing mass shootings at two Rockville schools: Wootton High School, which Ye had attended online, and Lakewood Elementary School, which Ye attended.