The Boston Regional Intelligence Center warned police on April 10 that the Boston Marathon finish line was “area of increased vulnerability” and that spectators could be susceptible to a “small scale bombing,” according to the Los Angeles Times.
The intelligence report, funded in part by the Department of Homeland Security, did not identify any particular threat at the time, however. Brothers Dzhokhar and Tamerlan Tsarnaev used home-made bombs to set off two explosions at the marathon finish line on April 15, killing three people and injuring more than 200.
“The FBI has not identified any specific lone offender or extremist group who pose a threat to the Boston marathon,” it said, according to the Times.
