When a gunman entered Brown University's Barus and Holley engineering building on Saturday and opened fire on students taking final exams, some received the university's first active shooter alert only after friends had already texted rumours of the attack.
Two students, Ella Cook, 19, and Mukhammad Aziz Umurzokov, 18, were killed. Nine others were wounded. More than 400 police officers responded to the scene, according to reports, while frightened students barricaded themselves in dorm rooms and libraries during an hours-long lockdown that stretched into the night.
