The investigation into the deadly shooting at Brown University is “progressing extremely fast,” cops revealed Sunday — after they detained a person of interest who is in their 20s....

Prosecutors said the suspects include three Moroccan nationals, an Egyptian, and a Syrian man....

"We're all saddened and scared and tired, but what they've been through is something entirely different."...

A Brown University student describes his experience during the deadly campus shooting to ABC News' Whit Johnson....