Exchange of fire
"At one location, four suspects surrendered and were arrested without incident. Luqman Ameen Abdullah did not surrender and fired his weapon. An exchange of gun fire followed and Abdullah was killed," the FBI statement said.
Abdullah regularly preached anti-government rhetoric and some of his supporters had converted to Islam while in prison, the FBI said.
Dawud Walid, the executive director of the Council on American-Islamic Affairs, said that members of the Muslim community were "shocked" at Abdullah's death.
"He was well-known and respected. No-one that I have talked has said that he was linked to any sort of extremist groups, overseas or here at home," he told Al Jazeera.
"I do not have any knowledge as to the veracity of the allegations [against Abduallah and his 10 followers] but if the allegations are true, what does that have to do with Islam or Muslims?
"The charges that have been filed against the 11 suspects have no relation or linkage to their religion - they are gun charges. We resent the fact that the FBI has linked religion to these gun charges."