Overview

• University alerts instructed students to barricade in rooms or classrooms after reports of a gunman.
• Police moved onto the campus following the initial reports and reinforced the shelter-in-place directive.
• Social-media video showed people running from an outdoor event near student housing with several white chairs overturned.
• The incident occurred at the private Catholic university in the Philadelphia suburbs.
• Authorities had not announced casualties, a suspect description, or containment details at the time of the latest reports.