Hannah Chen, a junior at Brown University, leaves flowers at the Van Wickle Gates at the Brown University campus in Providence, R.I., on Monday, Dec. 15, 2025. (Christopher Capozziello/The New York Times) By MARK ARSENAULT, NICHOLAS BOGEL-BURROUGHS and THOMAS GIBBONS-NEFF The first police officers arrived just after 4 p.m. on Saturday Dec. 13 after reports of an active shooter at Brown University. They found a lecture room full of gunshot victims in one of the science buildings. The body of...