Investigators and the public have criticized a bungled manhunt after Providence police released newly enhanced CCTV showing a masked suspect wandering near Brown University shortly before a campus mass shooting that killed two students and wounded nine.The footage, taken about two hours before the attacker entered an economics lecture in Barus & Holley, shows a person in dark clothing and a black mask loitering, sometimes running and carrying a satchel while investigators analyze terabytes of video and say they are back to square one after briefly detaining and releasing a suspect.Brown President Christina Paxson identified the dead as Ella Cook and Mukhammad Aziz Umurzokov, Rhode Island Attorney General Peter Neronha warned "We have a murderer out there", Providence Police Chief Oscar Perez urged the public to check personal video, and the FBI is offering a $50,000 reward as officials face anger over why alerts were not issued.