While homegrown Muslim extremists have proven more lethal in Europe than in the United States, US authorities continue to worry about the prospect of attacks by militant Muslims who are American citizens. Domestic extremists have a longstanding [sic] trend of committing terrorist attacks on US soil, according to the FBI. However, right-wing extremists are still considered the most dangerous to the United States. The FBI says right-wing extremists have the potential to carry out the most ...