 They are also investigating whether he was influenced or inspired by anyone. There is no indication of links to a foreign terrorist group. No motive has been determined at this time. FBI is looking into all possible theories, including whether he was politically motivated homegrown domestic violent extremist. The number one concern of FBI has been racially and ethnically or politically motivated domestic extremism during this election cycle. The FBI is combing through the social media online postings and emails for clues to motive.