Providence police released several minutes of video showing the still-at-large suspect and expanded a public appeal with a $50,000 reward and a vigil planned, after a gunman killed two students and wounded nine at Brown University four days earlier.Chief Oscar Perez and Rhode Island Attorney General Peter Neronha said investigators, backed by the FBI, have collected nearly 200 actionable tips, urged residents to submit surveillance dating back a week and have asked to interview everyone present in the building on the day before and the day of the attack.Victims Ella Cook and Mukhammad Aziz Umurzokov were killed, one patient remains critical and others are in serious or stable condition, while Brown President Christina Paxson, Mayor Brett Smiley and Governor Dan McKee announced campus restrictions and increased patrols as the manhunt continues.