An obscure private firm hired by the State Department over internal objections to protect U.S. diplomats in Benghazi just months before the American ambassador and three others were killed was staffed with hastily recruited locals with terror ties who helped carry out the attack, multiple sources told Fox News.

The explosive charge against Wales-based Blue Mountain Group comes from several sources, including an independent security specialist who has implemented training programs at U.S. Consulates around the world, including in Benghazi, where he trained a local militia that preceded Blue Mountain. The source, who spoke on condition of anonymity, said Blue Mountain used local newspaper ads to assemble a team of 20 guards, many of whom had terror ties, after securing a $9.2 million annual contract.