The 2012 attack on the U.S. diplomatic facility killed four Americans . A senior administration official said that while there is no evidence of a direct link between al Qaeda and ISIS, it was clear from their actions in Libya last year that they were looking to expand into North Senate committee report notes 15 people cooperating with FBI probe were killed . Also , people with al Qaeda-related groups participated in the armed assault .
The 2012 attack on the U.S. diplomatic facility killed four Americans . It has become a political flashpoint over security preparations , intelligence , response . Senate committee report notes 15 people cooperating with FBI probe were killed . Also , people with al Qaeda-related groups participated in the armed assault .