Brown University shooting suspect driven by 'accumulation of grievances,' FBI says

The gunman behind a deadly shooting at Brown University in December appeared to have been aggrieved by personal failures and sought retribution against those he deemed responsible, federal authorities said on Wednesday. More than four months after Claudio Manuel Neves Valente opened fire on the Ivy League campus, killing two students and injuring nine others, officials with the FBI’s Boston division announced they had concluded a significant portion of their investigation into the shooter. …