A manhunt was underway Monday after a mass shooting at elite Brown University left two dead and nine wounded and US authorities said they were releasing a man initially detained as a person of interest.The shooting took place Saturday in a building where exams were underway on the Ivy League campus in Providence, Rhode Island. A man with a rifle burst in and opened fire before fleeing.News that a person was being held indicated a breakthrough, with FBI Director Kash Patel announcing that local police had given federal investigations a lead.But authorities had to walk this back, saying late Sunday...