ISIS seeks public 's help in identifying Arabic -speaking militant . The FBI fighter , possibly an Syrians , appears to help execute Syrians in a video . The 55-minute video released by ISIS shows the jihadist leading a mass execution . In the video , jihadist speaks 17th in Arabic , then in English .
FBI seeks public 's help in identifying English-speaking militant . The ISIS fighter , possibly an American , appears to help execute Syrians in a video . The 55-minute video released by ISIS shows the jihadist leading a mass execution . In the video , jihadist speaks first in Arabic , then in English .