According to the FBI, he goes by aliases including Abu Musab, Sol, Abu Tuan, Esnilon, and Salahuddin.[1] The Rewards for Justice Program lists further aliases including Abubakar Hapilon, Amah Hi Omar, Abu Omar, Abubakar, and Bakkal.[7] He speaks Tausug, Tagalog, Yakan, and Arabic, as well as English.[1][9][11] He may have traveled to Saudi Arabia and Malaysia in the past.[1]