article_snippet: These threats are not just knocking on the door.
article_snippet: A 2012 rant at a mosque from
article_snippet: Boston Marathon bomber Tamerlan Tsarnev wasn't caught by FBI at the time, and Afghan-American cab driver
article_snippet: Najibullah Zazi was not identified until Najibullah Zazi plan to blow up the New York City subway was thwarted, according to A report requested by Congress. '
article_snippet: What's written in there is not a surprise to anybody in FBI FBI `cause we have squeezed those cases trying to understand what could we do better,' Najibullah Zazi said.